Harris died later that morning, while Boykin died at Cape Fear Valley Medical Center on the next day.
Detectives say they want to talk to a person of interest, who was seen in surveillance video on the morning of the shooting.
They say they believe the person drove another man with a gunshot wound to the leg to Wake Med in Cary for medical attention.
Detectives have not been able to identify the man.
Anyone who can identify the person of interest, or who knows of his whereabouts is urged to call the Cumberland County Sheriff's Office at (910) 323-1500 or you may use our anonymous TIPSLINES at (910) 484-TIPS (8477).