Top 10 Saddest Warrior Cat Deaths

The world of Warrior Cats is full of adventure, loyalty, and heartache. As you follow the stories of brave warriors, wise leaders, and the struggles of their clans, it's impossible not to feel deeply connected to the cats who shape these tales. With every victory, there's often a loss that stays with you, leaving you mourning alongside the characters. Some of the most emotional moments in the series come from the deaths of these beloved cats. These moments change the course of their clans forever.

In this list, we're looking at the saddest Warrior Cats deaths. These are the moments that made you cry, made you pause to catch your breath, and maybe even put the book down for a moment to process what just happened. Each death tells a story of sacrifice, love, or loss that has touched thousands of fans. Now, it's your chance to reflect on those moments and vote for the ones you think deserve to be at the top of the list.

The Top Ten

Bluestar

Bluestar is a character in the Warrior Cats book series and served as a leader of ThunderClan. She broke the warrior code by becoming mates with Oakheart of RiverClan and giving birth to three kits: Stonefur, Mistyfoot, and Mosskit. Stonefur and Mistyfoot remained in RiverClan, while Mosskit tragically... read more

Bluestar was such a great cat. I mean, she should have lived longer! She was so determined to help her clan and never gave up! So again, I hate you, Tigerstar! She should have lived longer, but to her, death was not an obstacle. She still cared for her clan, and she is a cat I will not forget!

I hated when Bluestar died. She lost her mother, sister, and kits. She didn't deserve it. I mean, sure, she became a psycho, but that was because of Tigerstar, so it's his fault she became a psycho. When I was reading Bluestar's book, she said, I will not let you destroy my clan, which showed she cares about her clan.
Firestar

Firestar is a central character in the Warrior Cats series. He rises to become the leader of ThunderClan after Bluestar. Firestar is mates with Sandstorm and has two kits named Squirrelflight and Leafpool.
Originally, Firestar was a kittypet named Rusty before joining the clan. He dies from fatal... read more

I loved Firestar. He was the most loyal cat ever, even though he started as a kittypet, then warrior, then Clan leader! He was a noble and caring cat who gave up all his lives for others, but when the Dark Forest arose, it was Tigerstar who sought the killing blow to kill Firestar, so once again I hate you, Tigerstar! However, at the same time Firestar killed Tigerstar. This is one cat the Clans won't forget!

My favorite character. I cried when I was reading about his death. He was the best cat you could ever think of. He had a true warrior's heart and always did his best for the Clans, even if it meant his own death.
He spent his last moment saving his clanmates from Tigerstar. I couldn't believe it when I was reading it. Firestar was a character who will never die to me. But he did. He was like a god to me.
May StarClan light your path, Firestar. Be happy there.
Silverstream

Silverstream is a character created by Erin Hunter for the book series Warrior Cats. She is a sleek, soft-furred, slender silver-and-black tabby she-cat with a finely shaped head and bright blue eyes. She is the daughter of Crookedstar and Willowbreeze, the former mate of Graystripe, and mother of Feathertail... read more

Silverstream was such a beautiful cat, and her love for Graystripe was heartwarming. The sacrifices she made to leave her camp every time to meet with her true love, even if it broke the warrior code, broke my heart. It was so sad to see her die.
Her last words were so heartbreakingly beautiful: "Goodbye, Graystripe. I love you. Take care of our kits."
Her legacy was amazing, as her two kits became part of a prophecy, and one of them died a noble death to save the Tribe.
I'm not mad that Graystripe soon fell in love with Millie. A lot of people say Graystripe betrayed Silverstream, and part of me agrees. But Graystripe needed someone to spend the rest of his life with. Being alone with the burden of Silverstream's and Feathertail's loss must be hard.
Yellowfang

Yellowfang was a medicine cat originally from ShadowClan in the Warriors series by Erin Hunter. After being exiled by her son, Brokenstar, she was discovered by Firepaw, who later became Firestar, and taken into ThunderClan. There, she became a respected medicine cat and mentor.... read more

Fireheart found her in the forest, and I feel so bad that she passed away. Her last words were, I wish you were my son, but I could never bear a son like you.

Why is Yellowfang's death #8? It was so sad and sudden when the forest fire happened, and Yellowfang was trapped in the camp. She also had such a sad life and did not deserve to die, especially because of how poorly everyone treated her. Sure, she was a bit bossy, but that just makes it sadder and more tragic when she dies.
Now, Silverstream, seriously? Sure, it was kind of sad, but we only knew her for two books, and we knew Yellowfang for much longer.
When you think about it, Yellowfang also served a very important role. She became the next medicine cat of ThunderClan when Spottedleaf did not have an apprentice. But Silverstream, Feathertail, Hollyleaf, and Spottedleaf were all put into the story to add a little more entertainment, and some of them did not succeed. There is just too much forbidden love, but Yellowfang accepted it, and nobody else did.
I don't want to put any unnecessary hate on anyone's favorite character, but I have to say it's hard not to dislike them. So I just have to say: 100% Yellowfang.
Mosskit

Mosskit is a character in the Warrior Cats franchise who died of hypothermia. The little kit's last words were "Mother, can we go back yet? I'm getting cold." Mosskit was the daughter of Bluestar and Oakheart, and her story is detailed in the book Bluestar's Prophecy.

"It's getting cold, can we go home now?" Okay, I don't know if that was the exact wording, but still! She literally died from the cold. I honestly blame Bluestar for this. She could've at least tried to warm up her poor little kit! I still like Bluestar, though.

What an unnecessary death. She could have grown to become a great warrior.
When I was reading "Bluestar's Prophecy" and Mosskit was born, I always thought her warrior name would be Mossfern. Until she died. She never deserved to die, and even worse, she died because her mother broke the warrior code. I am not saying I hate Bluestar. I just dislike the choice she made with Oakheart.
Hollyleaf

Hollyleaf was a rare and fiercely loyal warrior of ThunderClan. Her birth violated the warrior code, which caused her deep internal conflict.
She killed Ashfur out of fear that he would reveal the truth about her parentage. Afterward, she lived in the tunnels for a period of time before ultimately... read more

What a weird cat. Killing Ashfur and then revealing the secret to a whole gathering, I mean, come on. Then fighting to the death to save her clan. What a kind cat!

Hollyleaf.
From Leafpool's Wish to The Last Hope, she was smart, loyal, and brave. She trained harder than the other apprentices and cared for her family and Clan more than anyone could know.
She was more upset than ever when she realized her birth, her existence, was against the warrior code. That was when she fell apart. She killed Ashfur in an attempt to protect her brothers. She then attempted to kill her own mother and fled.
After some time in the tunnels, however, she regained her strength. She fought hard in the Great Battle and died saving Ivypool. She forgave Leafpool and Squirrelflight when she died.
RIP, strong Hollyleaf. We still miss you so much. Rejoice with your mother, grandparents, and mate in the stars.
Spottedleaf

Spottedleaf was a medicine cat under Bluestar's leadership in the forest territories. She was born as Spottedkit to Adderfang and Swiftbreeze along with her littermates, Redkit and Willowkit. Initially, Spottedpaw was apprenticed to Thrushpelt but decided to become a medicine cat with Featherwhisker... read more

I hate both ways she died. When she died the first time in "Into the Wild," I cried. She was extremely young and never had an apprentice to pass her skills onto.
She died bravely, saving her Clan. Later, in The Great Battle, she wanted to give her former lover one last gift by saving Sandstorm. She succeeded but died at the paws of Mapleshade in the process. She was always selfless and cared for her Clan above everything. What a brave medicine cat who never deserved to die.

Spottedleaf is one of my favorite medicine cats. Stop saying she's too old for Firestar because it's actually not true! Six moons until her apprenticeship, let's say one year of training, then about four moons of being a medicine cat since the book states she's young. Spottedleaf was just around two years old while Firestar was six moons old! They only have 1 year and 4 moons between them. So stop saying she's too old for him, because she's not.
That being said, Spottedleaf was one of the most caring, gentle, and selfless cats ever. She died saving Sandstorm because she didn't want Firestar to be sad. I can't even begin to imagine how much she loved him!
Feathertail

Feathertail is a fictional character from Erin Hunter's Warrior Cats book series. She is described as a slender silver-tabby she-cat with sky-blue eyes and a plump tail. She is the daughter of Silverstream and Graystripe, the sister of Stormfur, and the first love interest of Crowfeather.... read more

Feathertail's death makes me cry over and over again. The fact that her true love, Crowfeather, fell in love with Nightcloud hurts.
I feel like Crowfeather doesn't even like Nightcloud that much. As for Leafpool, I just feel like Feathertail and Crowfeather deserved each other more than anyone. Their love and kindness were beautiful.
When she was alive, Feathertail changed Crowfeather's life. She was kind and patient with him, and the fact that Crowfeather wanted to name himself after her was so heartbreaking. Their love was true. Why did she have to die?

Feathertail had a whole life ahead of her. She never got to see the Clans in their new home and never got to be with Crowfeather. She's my favorite character and was an amazing cat. Farewell, Feathertail.
Mossfire of ThunderClan
Cinderpelt

Cinderpelt is a Medicine Cat from the Warriors book series by Erin Hunter. She is described as a small, fluffy, sleek, and soft-furred she-cat with a smoky dark gray coat and wide blue eyes. Originally, she trained as a Warrior apprentice but was redirected to the path of a Medicine Cat after a monster... read more

Cinderpelt's death got to me because she was attacked by a badger protecting her friend's kits. She was my favorite medicine cat. No hate, Yellowfang.

It's honestly so sad. Cinderpelt wanted to be a warrior, but because of Tigerstar, she couldn't, so she had to become a medicine cat. This also meant she couldn't mate.
When she got in that argument with Leafpool, her whole life technically flashed before her eyes, and she mentally broke down. It's even sadder since Leafpool and Cinderpelt were close and loved each other almost like family.
Even worse, she knew she would die but was okay with it. That takes a lot of courage. Cinderpelt's death was an integral part of Leafpool running away and coming back. Without Cinderpelt, most of the Warriors' story would change.
Any time a cat dies in the series, it is tragic, but losing someone as important and loved as Cinderpelt is just an extreme loss.
Swiftpaw

Swiftpaw is a fictional cat character from the Warrior Cats book series written by Erin Hunter. He appears in the original arc as an apprentice in ThunderClan. His storyline is notable for his bravery and tragic fate, which has left a lasting impression on readers of the series.

He literally died trying to prove himself as a warrior and saved Brightheart from dying.
Bluestar made him feel useless and refused to give any apprentice a ceremony.
Brightheart and Swiftpaw would have been mates. I just know it!
I'm glad Firestar tried to do something to help. Of course, it didn't work because Bluestar was depressed back then.
I just loved his personality and how he tried to be like Longtail.
Erin Hunter should have waited until he was a warrior for him to die, at least.

Swiftpaw's death was sad to me. He was nervous about becoming an apprentice, but Longtail and Swiftpaw were a great mentor and apprentice pair. They got along so well, and Swiftpaw looked up to him.
When Swiftpaw learned about the dog pack, he wanted to prove himself because Cloudpaw had become a warrior before him, as had his best friend Brightpaw. Swiftpaw wanted to prove that both he and Brightpaw were ready, so they went to find the cave where the dog pack lived. Sadly, Brightpaw ended up losing half of her face, and Swiftpaw died.
Brightpaw said, "I didn't know when it came to an end for Swiftpaw, but all I remember is that he fought like all of LionClan." The fact that Swiftpaw gave Firestar one of his lives was heartwarming.

The Newcomers

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Rowankit

Aww... he was just a kit! Imagine someone you could have saved dying just because you were too late!
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Bristlefrost

One of the worst deaths out of all of them. Bristlefrost can't even go the StarClan after her death because her spirit faded while drowning Ashfur in the Dark Forest water :,(
I would cry so hard for her! She was such a kind, brave and caring cat!

Her death is literally the only death I've ever shed tears on. She never deserved to die. She and Rootspring should have lived together and been mates and lived happily ever after.

Bristlefrost's death made me cry - the way she knew she was going to die but she did it anyway, all to destroy Ashfur and save the clans. Poor Rootspring.

The Contenders

Stonefur

Stonefur is a supporting character in the Warriors book series by Erin Hunter. He was born to Bluefur (later Bluestar) and Oakheart and was raised in RiverClan alongside his sister Mistykit. He later became deputy to Leopardstar and was known for his loyalty and strength.

It was quite traumatizing to read about Stonefur's death, in my opinion. I mean, he was killed for not killing his own apprentice. That's just messed up.
I honestly think Leopardstar was weak during the time of TigerClan. She let her own deputy be killed for no reason. Being half-Clan does not mean you're a traitor. Tigerstar is not half-Clan and he is such a traitor.
He should have let Darkstripe die. I would have been glad. Darkstripe still supports Tigerstar after everything he did to ThunderClan.

How is he not the saddest? I mean, he was killed for not killing his own apprentice! He had a choice! He could have lived, but he chose not to because he wouldn't do what wasn't right. He was all starved and stuff when he had to fight Darkstripe, but he still beat him.
Then, no, no, no, that wasn't the end. Tigerstar ordered Blackfoot to help kill him! This was in front of everyone, even Leopardstar, and no one did anything. Firestar and Graystripe couldn't intervene, or else they would have been killed too. With Blackfoot's help, they held him down and killed him. They cut open his throat in front of everyone, including two skinny, scared apprentices. And no one even mourned his death, except Leopardstar did quickly so no one would see. Mistyfoot saw her dead brother and ran to mourn him while they were trying to get away. Sad!
Snowfur

Snowfur is a fictional character created by Erin Hunter for the Warrior Cats book series. She is Bluestar's sister, Whitestorm's mother, and was Thistleclaw's mate during her lifetime. Snowfur was a ThunderClan queen before her death, which occurred when she was hit by a car while trying to drive out... read more

Snowfur has no issues as far as I'm concerned. Whitekit/Storm was born pure ThunderClan. His father was the typical I'm going to kill your sister type of guy. The only problem was the stupid ShadowClan cat. Bluestar had tried to stop Snowfur, but Snowfur was set on being as loyal as she could be, even if it meant dying while her kit was waiting for her.
Why is she ranked so low? Firestar's death was honestly a happy one. He should be #9, and she should be #2.

It was the saddest death for me and it caused so much too. Snowfur died, so:
- Thistleclaw turned violent.
- Tigerstar turned evil.
- Tigerstar went to the Dark Forest.
- Hawkfrost went to the Dark Forest, and Brambleclaw was born.
- Ivypool went to train in the Dark Forest.
- The clans learned about the great battle.
Now, I may be wrong about some of that. I'm a little rusty, but you get my point.
Honeyfern

Honeyfern is a character from the Warriors book series by Erin Hunter. She is a ginger she-cat and one of the kits of Brackenfur and Sorreltail.
Her siblings include Molekit, Cinderheart, and Poppyfrost. Honeyfern died young after being bitten by a deadly adder while saving Briarlight, who was... read more

I was reading this book in class once, and when Honeyfern died, I cried SO MUCH.
I never liked Berrynose and Poppyfrost, and I really wanted Honeyfern to be with Berrynose. Honeyfern died protecting some kits, specifically Briarkit or Briarlight, and that was so unfair. Honeyfern should have lived. She is literally one of my top 10 favorite Warrior Cats.

Honestly, how much of a pointless death was this? I'm not saying that Honeyfern is bad, but this death was really unfortunate. Poor Honeyfern. I wasn't a fan of hers, but she deserved so much better than getting killed off just so Hollyleaf could feed Leafpool the deathberries. It's a pretty poor excuse for an innocent character.
What makes it even worse is that she died while pregnant. That's horrifying to think about.
The only time I really felt sympathy for Berrynose was before he moved on to Poppyfrost. It's not that I don't like them together. It's just how quickly Berrynose moved on with someone else.
At least with Graystripe and Millie, they took time to think things over. Berrynose seemed like he just moved on for the sake of her sister. I guess Berrynose loved Poppyfrost more, but it could have had moments like Graystripe and Millie did in the manga series.
Moonflower

I was crying when I saw that she died, but the whole attack on the medicine den because of some stupid fake prophecy was so stupid! Why did she have to die to that dumb medicine cat, whose name I forgot? I felt so sorry for Bluekit and Snowkit!

I wonder how a medicine cat can't feel sorry for killing an innocent cat's mother. She was so young, so emotional, and Eagleheart didn't even look like he regretted his actions! I get it, she was destroying the medicine supply, but really? The warrior code says you don't need to kill to be a good warrior. And he isn't even a warrior!
I just really don't like Eagleheart. He has the nerve to taunt the poor, young warrior at a gathering, too! Killing an innocent apprentice's mother and not even feeling sorry. What a medicine cat he is.
Ferncloud

Okay, first of all, Ferncloud didn't have 'too many kits'. She only had like three litters. You probably think that is a lot, and it kind of is, but her first litter, Shrewpaw, died. In the second one, Lark-kit and Hollykit died. And in the other one, later on in the books, Icepaw (I forgot what her warrior name became) and Fox Leap both died.
I hate you, Brokenstar! You are called that because of your broken heart! I also love Yellowfang. She killed Brokenstar twice for being a monster and killing Ferncloud! I really cried so much when Ferncloud died. She was one of my favorite characters...

Stupid Brokenstar. He stayed behind after the Dark Forest Battle in The Last Hope was over and grabbed Ferncloud, sweet, gentle Ferncloud, by the neck, snapping it and killing her. Yellowfang bit down into his own neck, killing him, because she was so angry her own son could do that. But Dustpelt and her full-grown kits were crushed. May the heavens guide your spirit across the stars forever, Ferncloud. Rest. Your life's work is done.
Whitestorm

Whitestorm is a fictional character in the Warriors novel series by Erin Hunter. He is a long-haired, sturdy white tom with green eyes, known for his loyalty, wisdom, and calm demeanor.
A senior warrior of ThunderClan, Whitestorm mentored many young apprentices and was respected for his courage... read more

NOOOO, I cried so hard when he died! He never deserved death by absolute rock-head Bone, and Bone should have met the same fate as Tigerstar for murdering my boy.

NOOOOO! First, his mother dies, and he is taken care of by his mother's sister, Bluefur, instead of his actual father, Thistleclaw. Then, he dies a while later in the 6th book!

Maybe long -
Spoilers
Whitestorm... Oh, Whitestorm. You were such a loyal, noble cat. Your life wasn't easy either.
I mean, you lost your mother at an alarmingly young age. Your father essentially favored Tigerstar over you and attempted to distance Bluestar from you. Your aunt, who was like a mother to you, went insane, and there was nothing you could do about it no matter how hard you tried.
When you went to battle BloodClan, you knew very well that you were going to die. You knew that Graystripe was meant to be deputy, not you. Yet you, the fluffy white tom, went anyway, and you fought with all your might.
You even told Firestar that Graystripe was meant to be deputy, which reassured Firestar and the rest of the clan. So, I say this as I try not to cry: R.I.P. Whitestorm, you shall be missed.
Brindleface

Brindleface is a pale gray tabby she-cat with darker flecks and green eyes. She was a ThunderClan warrior who served during the leadership of both Sunstar and Bluestar in the forest territories. She was born as Brindlekit to Robinwing and Fuzzypelt and had a sister named Frostkit.... read more

Brindleface's death kind of scarred me as a kid when I began reading these books. Like, imagine being slaughtered by your former clanmate, then being left bloody and dead, good only for bait. I'm pretty sure it was implied that the dogs tore her apart before attempting to attack ThunderClan.
She seemed like an interesting character though. I would've liked if she stuck around a bit longer so we could get to know her better.

Brindleface was a very mother-like she-cat, and she was super kind and friendly! Stupid, murderous Tigerstar had to show up and kill her just so the dogs could get a taste of cat blood. I know this isn't about Tigerstar, but how many cats has he killed?
Runningwind, Redtail, Oakheart, Gorsepaw, Brindleface.
He indirectly killed Swiftpaw, Bluestar, and technically Graypool. What I'm trying to say is, Brindleface didn't really deserve to die. She's innocent!
-Witheredpaw.
Willowbreeze

Willowbreeze is a pale silver-gray tabby she-cat with soft fur and amber eyes.
She was a warrior of RiverClan during the leaderships of Hailstar and Crookedstar. Willowkit was born to Fallowtail of RiverClan and Reedfeather of WindClan, alongside her sister Graykit. Reedfeather revealed his identity... read more

I hardly ever cry at Warrior Cat deaths, but I cried so hard during this one. I was crying so much that I hardly even noticed Crookedstar's kits died.
Then I had to read that part again to get the full impact from their deaths. Overall, I cried for like 30 minutes straight.

Okay, when Firestar died, I admit, I cried. But when I read Crookedstar's Promise, I was bawling my eyes out when she wanted to name the kits and she was telling Crookedstar to be brave. I cried even more when he confronted Mapleshade. Then, at the end of the book where he gets into a fight with Oakheart, it ends with him telling his only surviving kit that he's her father. I'm still pretty upset that she died too, after kitting Graystripe's kits.
Flametail

Flametail's story was absolutely heart-wrenching. I can't even put it into words. All Flametail ever wanted was to be a medicine cat. From the time he was a small apprentice, this was his dream. However, as soon as he achieved this role, he was plagued with ominous dreams foreshadowing dark times ahead. And then he died - while having fun, no less. He was playing a game with the apprentices, one of the few moments we actually see him genuinely happy. And that led to his death.
What's even worse is that, as he was dying, an ancient cat's spirit told him his life didn't matter. "Leave him, Jayfeather! It's his time to die, not yours!" So he was left to drown, with Jayfeather not even giving it a second thought. I'm not blaming Jayfeather for his death - definitely not my dear Jayfeather - but Flametail did not deserve that fate. May he forever rest in peace.
Lionheart

Lionheart was one of my favorite characters when Book 1 started. I was so excited to see how his life would play out, and how he would be there when his kits became apprentices. But then, he was killed. This poor man didn't even get to see his kits become apprentices. Cinderpelt and Brackenfur were even made apprentices early!
I really hate the old ShadowClan. They killed both Lionheart and Spottedleaf in cold blood and then tried to steal Frostfur and Lionheart's kits! Lionheart will forever be remembered as a great deputy. -Fallen from before StarClan

Lionheart was a good cat. My friend didn't care for him, but I told her I cried when he died. He was the mentor of Graystripe, Fireheart/Firestar, and even a little of Ravenpaw, and that made her cry for Lionheart's death. May StarClan light his path.
Sometimes I wonder if Tigerclaw killed Redtail wanting to be deputy. But when Lionheart was named deputy, what if Tigerclaw killed both deputies? (I know he killed Redtail.) What if he secretly attacked Lionheart to become deputy? The medicine cat thought it was a ShadowClan warrior, but still, I wonder.
Anyway, I love Lionheart, and if you hate him, I hope this changes your mind. Do you think Tigerclaw killed both Redtail and Lionheart for revenge?
Longtail

Longtail is a lean, pale brown or silver tabby tom with black stripes, a "V"-shaped nick in his ear, and a long tail. He was a ThunderClan elder who lived under Firestar's leadership in both the forest and lake territories. Before becoming an elder, he served as a warrior under Bluestar and Firestar.... read more

I am totally blaming Mousefur for that. Stupid old coot. It's her fault he died.
His death is the only time I ever cried over a book, and I am still not over it. He was my favorite character in all books and all fandoms. I also loved his personality and humor a lot. He was brave enough to stand up to Tigerclaw and saved a kitten from an owl.
If he hadn't been there, the Clan would have been eaten by dogs. He went through the mountains despite being blind. A tree shouldn't have ended that.

I burst into tears when he died.
Lots of people's first impressions of him when they read Into The Wild for the first time are: "I don't like him. He tried to fight Rusty, and he has a bad attitude."
I feel sorry for him because Firestar didn't trust him until later on. He didn't finish mentoring all of his apprentices, and he got his eyes scratched out! Poor Mousefur was devastated when Longtail died.
DUMB TREE.
Badgerfang

Badgerfang is a character from the Warriors book series who appears in Yellowfang's Secret. He is described as a fluffy black kit with a white stripe running down his face. Despite his young age, he is remembered as a brave and loyal character in the story.

Badgerfang's life was generally so sad. He was forced into apprenticeship way earlier than needed, and then died in a battle before he got his warrior name. I think it was nice of them to give him a name before he died.

Poor little Badgerfang died young in a battle against WindClan because Brokenstar was apprenticing kits at three moons!

Just look at the picture. When he tells Flintfang what a good mentor he is and how he wants to be named after him, I start wailing. STUPID, DAMNING, insert swear word here BROKENSTAR!
I wish that Badgerfang had the same opportunity as the other cats to live longer and be an apprentice at six moons like voice breaking and tears start everyone else. Starts wailing screams out the window BADGERFANG!
Redtail

Redtail was one of the bravest warriors in the entire clan. I can't believe he died from a rockfall. One day, he decided to go hunting and went with Fireheart, Bramblepaw, Sandstorm, and Bluestar. He was just about to sink his teeth into a vole under a very rocky hill when suddenly, a boulder started to roll down the hill. Redtail turned to run, but it was too late. He was squashed under the weight of the boulder.
Fireheart and Sandstorm came running, and Bluestar couldn't believe what she saw when she finally reached Redtail. They went back to camp with Redtail's body. When Bluestar told the clan that Graystripe would be the next deputy, the clan started to sit in vigil for Redtail. Graystripe was not too thrilled to be deputy, primarily because he hadn't had an apprentice yet.
The next day, Bluestar informed the clan that Graystripe would be the mentor of Cloudpaw. Redtail looked down from StarClan, feeling sad that Graystripe was the deputy. He knew Graystripe was not the right choice. StarClan sent a sign to Bluestar, indicating that Graystripe was not the right choice. Bluestar called a clan meeting and shared that she had received a sign from StarClan, revealing that Graystripe was not the right choice. She decided that Spottedleaf would be the deputy. However, Spottedleaf died only half a moon later.
One day, Bluestar was hunting where Redtail died and saw a kit sitting there. The kit looked almost like Redtail. Then she realized she didn't need a deputy until this kit was ready to become one. For now, Whitestorm would be the deputy. She was relieved that StarClan had given her such a clear sign.
Scourge

Scourge is a villain in the Warrior Cats series. He is the leader of BloodClan and was bullied by his siblings, Socks and Ruby, for being the smallest of the litter. One of his most notable features is his purple collar studded with dog and cat teeth.... read more

I agree that his childhood was not a very good one. He was considered the runt and the "weird" one. His littermates weren't the "best," and he always thought his mother didn't love or even care about him. He was traumatised by the encounter with Tigerstar, at that time known as "Tigerpaw."
But he needed to let go of the past and not kill others for his grief. I have no grudge against him for forming a Clan, but it wasn't a Clan in the form of a democracy like the ones led by Mistystar, Bramblestar, Rowanstar, and Onestar. Scourge formed a dictatorship. A dictatorship in which he was the dictator.
Ambition is quite alright, but Scourge, like Tigerstar, killed his way to power. If there was a war, that'd be different. After all, in real life, wars lead to bloodshed. But Scourge had other options other than killing the cats in the forest.
Mousefur

Mousefur is a small dusky brown she-cat who was a ThunderClan warrior during Bluestar's and Firestar's leadership in the forest and lake territories. She was born to One-eye and Halftail as Mousekit alongside her brother, Runningkit. As a young warrior, Mousefur took part in a Sunningrocks skirmish and... read more

Mousefur's death was not quite as sad as the others, but I think it is worthy of being mentioned here just because she was such a strong character. She seemed like a weathered rock, one who would endure forever and forever.
But then again, rocks do have to get completely eroded away sometime. And Mousefur's time came too.

I mean, I like Mousefur, but she is VERY far from my favorite character.
The real reason this death should be #1 is because Longtail, who had died relatively recently, had just come down from StarClan to fight beside her. They were so happy to see each other, and then SNAP! One dead kitty. Longtail was so sad, angry, and heartbroken that he wasn't able to protect her like he wanted to.
Also, this left Purdy in the elder's den for quite a while before he died and joined Mousefur and Longtail.
- Oakflight