The 2 Death mini series? (6 issues)
Dead Boy Detectives? (4 issues)
Dead Enders (16 issues)

Really, the best bet to round out a Deadman book would be to collect various other Bruce Jones issues.

'Reading' / 'Reading soon' stack: DC/Vertigo - ArtOps, Batgirl, Gotham Academy, Gotham by Midnight, Injustice; Marvel - Allred's Silver Surfer; Other - Abe Sapien, Descender, Fight Club 2, Goon, Mind MGMT, Southern Bastards