Congrats to @MangleTheFox1 for guessing the last cat! It was Featherwhisker! Here's the next one.....

Dark grey fur,
Black stripes,
Eyes of Amber,
Follower of murderer,
Not to be known,
Betrayal to clan,
Mentored Dust,
Almost killed Sorrel,
New clan entered,
Attempted killing Stone,
Helped by Black,
Watched friends death,
Killed by grey,
Shadows conceal forest,
Alone for eternity.

Who am I?