WARMINSTER, Pa.—Bucks County prosecutors have filed a first-degree homicide charge in the case of an 89-year-old woman killed during a police standoff and shootout at a suburban Philadelphia apartment complex.

District Attorney David Heckler says Andrew Cairns has been charged Thursday for his role in a Feb. 19 shootout with police that left Marie Zienkewicz dead in the crossfire.

Investigators say Cairns traded shots with police after a dispute with his girlfriend and barricaded himself in his Warminster apartment for several hours before surrendering.

Zienkewicz, who lived in the apartment below, was struck by a bullet during the altercation and found dead in her apartment after the gunfire.