Investigators say they have "significant new information" in the fatal September shooting of a suburban Chicago police officer that they will reveal at a news conference.

The Lake County Sheriff's Office is holding a news conference Wednesday to disclose the new details regarding Charles Joseph Gliniewicz. The statement Tuesday from the Sheriff's Office didn't reveal new information.

Gliniewicz died weeks before his planned retirement. His death prompted an outpouring of support, with thousands lining roads during his funeral.

The 52-year-old Fox Lake officer radioed on Sept. 1 that he was chasing three suspicious men on foot. Backup officers arrived to find his body 50 yards from his squad car.

A massive manhunt in the rural area northwest of Chicago ensued. No one has been arrested.