Claude 'Rappa' Clarke, 37, was on Wednesday night shot dead at his home in Brighton district, St Elizabeth.
Clarke was killed as he lay on his bed with his common-law wife and their one-month-old baby.
Police say at 12:45 a.m. Clarke and his family were lying on a bed when a man crept through an open window at the front of the house and shot him twice in his ribs. He died on the spot.
The Santa Cruz police have not yet established a motive for the killing.