Authorities told Newswatch 16 that Cody Gorsline, 24, Williamsport was flown to Geisinger Medical Center near Danville with life-threatening injuries.
Police said Gorsline was shot in the head around 2 a.m.
Troopers said Gorsline died from his injuries Monday.
Police say the victim had come to Derek Gair's home for Gair's surprise birthday party and that the two men went into an upstairs bedroom so that Gair could show Gorsline a gun.
According to police Gorsline was shot in the head as both men were handling the gun.
Kim Navich lives nearby and told Newswatch 16 that she and her son were leaving to buy Father’s Day cards when she heard something strange.
“We heard people crying. We heard them crying down the road,” said Navich.
After learning of the shooting she said, "It could have been an accident, on account of somebody thinking it was clean and then like kids, playing around thinking the gun is empty or the safety is on.”
Gair has not been arrested but police say the case will be forwarded to the Lycoming County prosecutor for possible charges.