Personification of Death. One of the Four Horsemen of the Apocalypse. He is considered the most powerful of the four horsemen.
Death first appeared in DC's Weird War Tales, presiding over tales of soldiers and wars but has also appeared to other DC characters in various forms. Usually he is depicted as a skeleton, either in military garb or more traditional Grim Reaper style clothing. In one issue of Swamp Thing, he appeared as a middle aged man along side the Phantom Stranger (seemingly based on the film Death Takes a Holiday) and married a newly deceased woman named Maggie Brennan. She taught Death to show compassion for the newly dead in order to help them better make the transition. This aspect is strangely in line with the Death of the Endless that would be created later.