The decedent has been identified as Joshua Mathis 19, of Hillsborough, N.J. According to the preliminary investigation, at approximately 6:12 p.m. on Jan. 9, officers of the Hillsborough Police Department responded to a 911 call reporting a man with a gun at an apartment on Corporal Langon Way. When officers arrived, they encountered Mr. Mathis inside the apartment. Mr. Mathis was holding a large knife. Mr. Mathis advanced toward the officers with the knife. One officer fired his service weapon, striking Mr. Mathis. Police and emergency medical personnel rendered first aid, and Mr. Mathis was pronounced deceased at the scene. The officer who discharged his weapon has been identified as Officer Christopher Michaels of the Hillsborough Police Department.