His throat/neck.
He kills him by using a part of the fox trap that was supposed to kill Firestar
I believe he was on his 6th life,but now,he only has 2 or 3 more lives.Recently, Russetfur took away one of his lives.He is close to death,but it does not show because he is such a strong leader.
Yes, in "The Darkest Hour," Firestar loses one of his nine lives in a fight against Bone and his rogues in what is referred to as the "fox trap" at Fourtrees.
Hawkfrost dies before Firestar, during the events of the final battle in "The Last Hope." Hawfrost is killed by Brambleclaw, who is later revealed to be his half-brother. Firestar dies in the same battle, succumbing to his injuries after defeating the Dark Forest warriors.
He and Brambleclaw were with Firestar, who was stuck in a fox trap, and Hawkfrost told Brambleclaw to tighten the trap and kill Firestar, but Brambleclaw killed Hawkfrost instead, fulfilling the prophecy "Before there is peace, blood will spill blood, and the lake will run red."
No cat really died but Berrynose lost his tail when he was a kit and Firestar almost lost a life.CherileClaw Brothers Lost All Tails Today CharileClaw Take Fox Trap To ClawHowler And Kil ClawHowler
Haawkfrost died when Brambleclaw stabbed him in the stomach with a stick. This was when Hawkfrost trapped Firestar in a fox trap and was about to kill him when Brambleclaw stuck with loyalty and turned on Hawkfrost.
Warning, this may contain a spoiler for Long Shadows...Hawkfrost created the trap for Firestar's death so Brambleclaw could become leader alongside him and they could rule the forest. But in the book Long Shadows, during the fire scene, Ashfur told Squirrelflight that he had helped deliver the message to Firestar because he wanted Squirrelflight to suffer unbearable pain for accepting Brambleclaw as a mate instead of him.
He dies when Firestar gets stuck in a fox trap and he wants Brambleclaw to kill Firestar so he can be leader. Brambleclaw reacts to his leader instead. Next, Hawkfrost threatens to kill Brambleclaw. He thinks quickly and shakes up the pole from the fox trap. Letting this get tamperd, he grabs the sharp pole and right when Hawkfrost pounces, she nails it right into Hawkfrost's throat.
Usually they will be caught in a metal trap. Copy and paste this link into search bar to see how they are killed: http://www.arkive.org/arctic-fox/alopex-lagopus/video-14.html
Well, in Warrior Cats, Darkest Hour, Scourge took all 9lives from Tigerstar with one blow, and if Brambleclaw had decided to kill Firestar with the fox trap, that would have taken all of his lives. So there is a way that the leaders lose all of their remaining lives.
The hunting of a fox on horseback and with dogs who track and trap the fox.