quirell

http://www.gradesaver.com/harry-potter-and-the-philosophers-stone/study-guide/character-list/

A man who attends Hogwarts as a the defense against the dark arts teacher. he has a social problem with stuttering.

He is a defense against the dark arts teacher who Voldemort attaches himself on Quirell. He later dies, due to Voldemort turning into ash/ dust.

The Defense Against the Dark Arts teacher. (DADA). Quirell actually dies cause he was attached to Voldemort, a powerful dark wizard who murdered Harry's parents.