Detective Isaiah D. Emenheiser, 43, was killed on September 17, 2025, while serving with the Northern York County Regional Police Department. Officers had gone to serve a warrant linked to a stalking investigation involving Matthew James Ruth. When officers could not find Ruth at his residence, they went to the home of the woman he was accused of stalking on Haar Road in North Codorus Township. The front door was unlocked and, as Detective Emenheiser and colleagues entered, Ruth—lying in wait—opened fire with an AR-style rifle.

Detectives Emenheiser, Mark Baker and Sergeant Cody Becker were fatally wounded in the initial volley. A fourth detective and a York County Sheriff’s Office deputy were also wounded; they returned fire as Ruth exited the house and continued shooting. Ruth was shot and died at the scene. The woman being stalked and her mother had left the home before officers arrived.

Emenheiser was a husband and father of a son and a daughter, a 20-year veteran of the department and a former U.S. Secret Service agent. His honors included the department Medal of Merit, a Lifesaving Award for rescuing a man from a burning mobile home in 2005, and Officer of the Year in 2010 for DUI enforcement. Anyone who knew Detective Emenheiser or witnessed events on Haar Road that day is asked to come forward with information.