Officials have released a mugshot of the gunman involved in the UPMC Memorial Hospital shooting that killed a West York police officer. The shooter, identified as Diogenes Archangel-Ortiz, entered the hospital on Saturday with a bag containing a handgun and zip ties.

On Saturday, Archangel-Ortiz returned with a bag full of zip ties and a semiautomatic handgun, police said. He shot and wounded three hospital staffers — a doctor, a nurse and a custodian — and took them hostage inside the ICU, cops said.