CHICAGO (AP) — Authorities will announce that a northern Illinois police officer whose shooting death led to a massive manhunt in September killed himself, an official briefed on the investigation told The Associated Press. The investigation into the death of Lieutenant Charles Joseph Gliniewicz determined that the Fox Lake officer died of a self-inflicted gunshot wound, other media outlets reported Tuesday, all citing anonymous sources. After Gliniewicz's shooting, a massive manhunt ensued, with hundreds of officers searching houses, cabins and even boats on a chain of area lakes. Flags flew at half-staff in honor of the 30-year police veteran after the shooting in Fox Lake, a close-knit community of 10,000 residents located about 50 miles north of Chicago.