On October 19th, 2011 Mercer County Sheriff’s Officer William Osterman was stabbed October 19, 2011 Stabbing – Mercer County Sheriff’s Officer William Osterman SUSPECT CAPTURED An off-duty Mercer County sheriff’s officer was stabbed twice as he tried to arrest a disorderly man at the Kingsbury Towers apartment complex. Officer Osterman was struggling with the suspect on the concrete stairs when he was stabbed. The suspect broke free, and Officer Osterman only realized he’d been stabbed when he saw and felt himself bleeding.