manslaughterer
criminal
crook
felon
killer
malefactor
outlaw
slayer
Jack the Ripper
assassin
assassinator
bravo
butcher
cutthroat
fratricide
gun
gun for hire
gunman
gunslinger
hatchet man
hired gun
hit man
iceman
infanticide
mass murderer
murderess
parricide
ripper
serial killer
serial murderer
shooter
torpedo
triggerman