DeadMan first appeared in Strange Adventures #205 (October 1967), and was created by Arnold Drake and Carmine Infantino.

Since that time, the character has had a few comic series and has made a ton of guest appearances.

Deadman Series 1
Deadman #1	Deadman #2	Deadman #3	Deadman #4
Deadman #5	Deadman #6	Deadman #7

Deadman Series 2
DeadMan Series 2 #1	DeadMan Series 2 #2	DeadMan Series 2 #3	DeadMan Series 2 #4

Deadman - Series 3
DeadMan - Series 3 #1	DeadMan - Series 3 #2	DeadMan - Series 3 #3	DeadMan - Series 3 #4
DeadMan - Series 3 #5	DeadMan - Series 3 #6	DeadMan - Series 3 #7	DeadMan - Series 3 #8
DeadMan - Series 3 #9