Here's the latest on the story:

ORIGINAL POST BELOW:

In an incredible twist, authorities are set to announce today that a Fox Lake police officer whose shooting death led to a massive manhunt in September killed himself.

That's according to the Chicago Tribune, which cites an official briefed on the investigation.

The Lake County Sheriff's Office has called a news conference to announce "conclusive results" of the investigation into the death of Charles Joseph Gliniewicz:

Around 8 a.m. Sept. 1, Gliniewicz radioed that he was pursuing two white males and a black male. Dispatchers lost contact with Gliniewicz, a 30-year veteran and a fixture in Fox Lake, and responding officers found him shot and his .40-caliber handgun rested nearby.

A few days later, Lake County Coroner Thomas Rudd said he couldn't at that point rule out suicide or any other manner of death. A month after Gliniewicz died, police said ...they could not yet rule on a manner of death, and police said there were signs of a struggle at the scene.

Gliniewicz long led the department's Explorers program, which gives aspiring officers up-close experience with policing. Some in town referred to him as G.I. Joe. Now the details of his death are set to be filled in later today.