State police say they believe Hollow shot Davis and then himself last night (Wednesday night) in Hollow's trailer home in Little Britain Township. Hollow died at the scene; Davis was pronounced dead early Thursday at Lancaster General Hospital.
Pennsylvania State Police Cpl. Adam Kosheba says Hollow's parents kept their guns in a safe, but the teen was able to get a hold of the .22 caliber rifle used in the shootings.
Investigators say the motive remains unclear.