PHILADELPHIA (CBS) -- A man was found shot to death inside of a home in Philadelphia's Overbrook neighborhood Wednesday night, according to police. The victim is believed to be a security guard.

Officers were called to the 900 block of North 68th Street at 7:40 p.m. for a report of an unresponsive man.

Police found a 48-year-old man in a first-floor living room suffering from a gunshot wound to the head. He was dressed in a security guard uniform when he was found, according to Chief Inspector Scott Small.

He was pronounced dead on the scene at 7:56 p.m.

No arrests have been made.

An investigation is ongoing.

For a list of gun violence resources in Philadelphia, click here.