Death was a member of Apocalypse's Four Horsemen during the 11th century when they encountered the Asgardian god of thunder, Thor during their spree of killing people. Thor engaged them in battle and killed them single-handedly. 
Powers and Abilities
Gaseous Body: Death seemed to possess a gas like body which allowed him to fly. It did not however, protect him from Thor's axe.
- While the full effect of his abilities are not revealed, Death references dreams when assaulting Thor, perhaps implying some ability to affect the subconscious.