Trainer police received a call at 12:48 a.m. for an unresponsive male at 3900 Post Road.
Once there police found the male against a fence. He suffered a gunshot wound to the head.
The victim has been identified as 30-year-old Kyle Haley of Marcus Hook.
No weapon was found at the scene.
Anyone with information related to the attack is being asked to call Trainer police at 610-494-7399 or County police at 610-891-4708.