Cain was the first! (8)
I believe the answer is:
murderer
(Other definitions for murderer that I've seen before include "One commits homicide" , "hit man" , "Assassin" , "Criminal killer" , "Serious criminal enters demurrer" .)
I believe the answer is:
murderer
(Other definitions for murderer that I've seen before include "One commits homicide" , "hit man" , "Assassin" , "Criminal killer" , "Serious criminal enters demurrer" .)