One of the most well-known elements of Warrior Cats is how violent it is, despite being a series about cats aimed at 9-13 year olds, there are quite a lot of Family Unfriendly Deaths in the series.
- Commonly when a warrior is killed by another cat, it usually involves their neck, either torn open or having it snapped. This happens to be the fate of some of the cats such as Reedwhisker due to the fall in River and Beetlewhisker at the jaws of Brokenstar in The Last Hope. Even worse, characters that die a slow, painful death tend to twitch when they die.
- In Dawn, Hawkfrost gets impaled with a wooden stake by Brambleclaw, causing his corpse to fill the lake with his own blood.
- One noteworthy death that involved the neck would be Ashfur getting his neck sliced open by Hollyleaf in Sunrise, due to its use of Blood Is Squicker in Water, and just how creepy his lifeless body bobbing around in the water, looking almost as if he was still alive.
- Cars or other kinds of machinery that hit a cat throughout the series often leaves them dying as the result of the impact. This happens to be the fate of Snowfur in Bluestar's Prophecy and Rain in Path of Stars.
- One notable gruesome example that involved cars is the death of Whitethroat in Rising Storm. After he got hit by a car, he continues to live for a few seconds afterwards before dying. He is also the only one to get completely flattened. Ouch...
- Poison is another type of death that gets brought up in this series, due to the fact a cat could die in a slower and more painful death as well as the poison circulating the blood.
- When Yellowfang poisons Brokentail in Rising Storm, not even Fireheart can bear to watch him writhe in agony, and has to leave. If something is too scary for these cats, it certainly isn't family friendly.
- In Sunrise, Honeyfern receives a seizure as she dies after being bitten by a venomous snake. The icing on the cake? She screams that her blood is on fire.
- In Mapleshade's Vengeance, Frecklewish gets tricked into being bitten by an adder, courtesy of Mapleshade. This causes Frecklewish to end up screaming in agony and couldn't be able to see anymore. Since Mapleshade murdered Ravenwing, ThunderClan's only medicine cat at the time, there are no other medicine cats to heal her. She ends up dying sunrises later in Pinestar's Choice.
- Even leaders that have nine lives are not safe from a gruesome death. In these cases, if the wound is severe enough, StarClan won't revive them.
- In The Darkest Hour, Tigerstar is torn open and bleeds to death at the claws of Scourge. According to Erin Hunter, nine of Tigerstar's organs were torn apart when Scourge struck him, causing his heart to be ripped out, his liver becoming damaged, lungs punctured, and bleeding to death from his veins.
- In Yellowfang's Secret, Brokentail betrays his father and leader of ShadowClan, Raggedstar, stealing all of the nine lives from him for his own selfish act.
- In Forest of Secrets, Silverstream ends up dying due to complications while giving birth, leaving Cinderpelt with complexes regarding the fact that she failed to save her.
- In A Dangerous Path, Swiftpaw is slaughtered by a pack of dogs, and although Brightheart didn't die, she loses an eye and half her face to the same dogs. Later in the same book Tigerstar murders Brindleface in order to use her body as bait for the dogs.
- In Moonrise, a mountain lion under the name of Sharptooth is shown to be capable of this by slaughtering (and presumably eating) cats, one by one. This happens to be a Karmic Death case, where Sharptooth gets impaled with a stalactite through his heart by Feathertail, who sacrificed herself to save the travelling cats and the Tribe of Rushing Water from any more slaughter. But still, it's very creepy for what Sharptooth is doing and how his death went.
- In Long Shadows, Tigerstar tortures Lionblaze with visions of him killing Heathertail in a series of extremely violent fashions. The only one we actually see is when he slices her throat open and blood pours out. The other dreams don't show him killing her, but show her mangled body and the messy results. You'll probably end up wondering how it is possible to spray so much blood everywhere...
- In Sunrise, Hollyleaf imagines a mouse as Leafpool, and proceeds to tear her to shreds in a fit of rage, the remains being described as a "red pulp".
- In the same book, the dogs are responsible for killing (and presumably ate) at least six cats, and apparently tore one of them to pieces.
- In The Fourth Apprentice, Rippletail has his shoulder torn open by a beaver's teeth, and then spends about an hour bleeding to death.
- Both of Antpelt's deaths. The first time in Sign of the Moon, Thistleclaw injures him so badly, his Clan thinks he's been savaged by a dog. He dies slowly from infection, over a few days. The second time in The Forgotten Warrior, Ivypool disembowels him, and he spasms while dying in a pool of his own blood.
- In Shattered Sky, Darktail starves the prisoners he takes, and later on has Needletail drowning to the point of exhaustion, before he, Sleekwhisker and Roach proceeded to finish her off for refusing to kill her surrogate sister Violetpaw.
- In Veil of Shadows, Berrynose is disembowelled by Tawnypelt, much like the killer's father was.
