YORK, Pa. — A police officer killed while responding to a Pennsylvania hospital siege was struck by a shotgun blast fired by another officer that also hit the attacker as he held a hospital worker hostage with a gun to her head, a prosecutor disclosed Wednesday.

The attacker and West York Patrolman Andrew W. Duarte were killed in the gunfire at UPMC Memorial Hospital in York on Feb. 22, while several other officers and hospital employees were injured. The disclosure that Duarte was killed by shots from fellow police came as York County District Attorney Tim Barker announced the findings of his investigation and pinned blame for Duarte’s death on the attacker.

That man, Diogenes Archangel-Ortiz, 49, was shot as he was attempting to leave the intensive care unit with a zip-tied hospital employee and a gun already emptied of bullets. It was then, Barker said, that officers fired 22 times, striking Archangel-Ortiz at least 15 times. The zip-tied hospital employee wasn’t hit, but an officer’s shotgun blast also felled Duarte and wounded a second officer, Barker said.

— The Associated Press