A passerby made a gruesome discovery in West Philadelphia Sunday night, police said, after finding a dead man inside the living room of an abandoned house.

Cops said the body of the man, who appeared to be in his 30s, was found at 7:16 p.m. inside a house on Salford Street just below Market, and he was pronounced dead by medics at the scene at 7:30 p.m. He had three gunshot wounds, cops said -- one in the chest, one in the left side and one in the right knee.

No word from police on how long they believe the man was dead in the house. An investigation into the circumstances surrounding his death was underway Sunday night.