By Kim Glovas

CLAYTON, NJ (CBS) — Law enforcement officials in Clayton, Gloucester County, New Jersey are looking for a killer after a pre-dawn murder.

Gloucester County Prosecutor Sean Dalton says 33-year-old Kenneth Mosley Junior was shot and killed inside his girlfriend’s home on Downs Street, an upscale neighborhood.

READ MORE: Philadelphia Students Finding Comfort In Rec Centers Again Amid Gun Violence Epidemic

Clayton police responded to a 911 call around 3:30 a.m. at that address.

“Reports of shots fired from the residence. Investigation revealed to date the victim was seated in the living room when the assailant shot through a sliding glass door, striking him.”

READ MORE: 'I Thought I Was Done': Residents Of Trevose Mobile Home Park Pick Up The Pieces After EF-3 Tornado

Dalton says this was not a random act, but a personal, planned attack, and that Mosley knew his killer.

Mosley lived in Fairfield Township, Cumberland County.

MORE NEWS: Pirates' Crowe, 2 Relievers 1-Hit Phillies, End 4-Game Skid

Anyone with information on the crime is urged to call the Gloucester County Prosecutor’s office.