Hernandez is #1

Marvin Harrison – one of the NFL's all-time great wide receivers, Harrison was accused not once, but twice, of shooting the same guy. The second time, before the man died, as he lay in the street, he told police that it was Marvin Harrison who shot him (for the second time). Harrison was never charged. It is unclear why.

Brian Blades – Former Seahawks WR was involved in a disagreement with a cousin. After going home to retrieve his gun, the gun accidentally discharged during a struggle and the cousin died. After being found guilty of manslaughter by a jury, the verdict was overturned by a judge, who apparently thinks arguing with someone, going home and getting a gun, having a physical altercation, and discharging the gun resulting in death is an "accident."

Anthony Wayne Smith – Former Raider lineman who has been charged with 4 murders over a nine year span, which I believe would make Smith the first NFL player/serial killer.

Jovan Belcher - Belcher shot and killed his girlfriend last season before driving to Arrowhead stadium and turning the gun on himself