Prosecutor says stalking suspect ambushed Pennsylvania police officers, killing 3Matt Slocum / Associated PressNORTH CODORUS, Pa. (AP) — A suspected stalker armed with a rifle hid inside his ex-girlfriend’s home in the rolling farmland of southern Pennsylvania and ambushed police officers who came to arrest him, killing three of them in a shootout, a prosecutor said Thursday. Ruth fired numerous rounds, killing three of the officers at the door and seriously wounding the fourth, Barker said. Ruth wounded a York County sheriff’s deputy before he and another Northern York County Regional officer shot the gunman to death by the road, Barker said. They were leaders within our agency, committed to protecting this community and standing beside their follow officers,” Chief Dave Lash said. All three slain officers were long-time veterans of the nearly 70-officer force, with almost six decades of combined service.