What makes a hitman different from a serial killer?

Ghost Assassin is the tale of hitman-for-hire, David. David isn't like other
hitmen. He has the ability to see and interact with ghosts. In his eyes there is
no difference between the living and the dead. But those he has killed do
not share his viewpoint. Will David's conscious ever be clean when the sins
of his crimes literally haunt him?
This limited edition presents the 3rd issue of Ghost Assassin in the finished penciled stage with lettering, prior to the colors being added. Written by Adam Watson with artwork by Joel Cotejar.