Death

The fourth and final horseman is named Death. Of all the riders, he is the only one to whom the text itself gives a name. Unlike the other three, he carries no weapon or other object (but some versions say that Death carries the scythe, symbolizing that he is the Grim Reaper); instead he is followed by Hades.

Death didn't make a physical appearance in, "Abandon All Hope" but his presence was released from its prison in this episode. Lucifer released Death with his ritual.

Normally Death is kept locked in a magical box/coffin 600 feet under the Earth as his power is apprently too dangerous to allow him to roam freely. Heaven only released him when God had something major planned such has the Great Flood, or as Bobby put it, "The last time they hauled him up, Noah was building a boat!"

Death is considered the father of all Reapers and the creatures who are normally neutral since death is impartial, all gathered in the town where Lucifer was going to release Death in order to serve him.

Family
Reapers (Kindred)

Lucifer (Leader)

War (Brother)

Powers
Indestructible 

Appearances
Abandon All Hope