Abattoir (comics)

Abbatoir (Arnold Etchison) is a fictional character from DC Comics. He first appeared in Detective Comics #625 (January 1991). A serial killer who was convinced that his family was evil, he felt that he needed to kill them, and believed that he absorbed something of their life force when he did so. He was apprehended and incarcerated in Arkham Asylum. He escaped when Bane set all the inmates free, and went on to kill several more members of his family. Eventually he was tracked down by  Jean Paul Valley, who was acting as Batman at the time.

Valley chased him into a refinery and nearly knocked him into a vat of molten metal. He was hanging from a plank above it, but Valley allowed him to fall to his death. Since Abattoir was holding an innocent man inside a secret, hidden torture chamber at an unknown location, Valley's action condemned that prisoner to death.