A gunman who held medical staff hostage before killing a police officer and wounding five others at a hospital in south-central Pennsylvania Saturday is believed to have visited the facility in the days leading up to the incident,

A funeral service will be held later this week for a Pennsylvania police officer shot and killed while responding to a hospital intensive care unit where authorities said a gunman had shot three hospital employees and taken staff members hostage last weekend.

Injured, 2 Dead in Pennsylvania Hospital Shooting, UPMC Memorial Hospital, Diogenes Archangel-Ortiz, Andrew Duarte