Who killed Mr Crouch in Harry Potter and the Goblet of Fire?

Answer 1

Barty Crouch Sr was murdered by his son, Barty Crouch Jr who transfigured his body into a bone and buried it in order to avoid detection.

Barty Crouch Jr was given the Dementors kiss, a fate described as worse than death.

Answer 2

Barty Crouch Sr was murdered by his son, Barty Crouch Jr, on the grounds of Hogwarts. Barty Jr transfigured his body into a bone and buried it in order to avoid being caught.

Barty Crouch Jr was immediately given the Dementors Kiss on Minister of Magic Fudge's orders. The kiss was administered prior to actually being questioned by the Ministry, and therefore he could not confirm that he had been working with Voldemort in order to return him to power and that they had been successful.

Answer 3

Barty Crouch Sr was killed by his son, Barty Crouch Jr.

Barty Crouch Jr was given the Dementors Kiss.

Answer 4

Technically, he isn't dead. He was kissed by a dementor which removed his soul. He is still alive, but is worse than dead since he has no soul.