Who committed suicide in Ken Kesey's One Flew Over the Cuckoo's Nest?

Answer 1

Billy Bibbit commits suicide after Nurse Ratched threatens to tell his mother that he was with a woman in the institution. He does so because he is afraid of his mother's disapproval.

Answer 2

The character who committed suicide in Ken Kesey's novel "One Flew Over the Cuckoo's Nest" was Randle McMurphy. He chose to end his own life rather than continue living in the oppressive environment of the mental hospital.