Official: Illinois cop's death will be declared a suicide

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Illinois Officer's Death Will Reportedly Be Ruled a Suicide

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 Lake County Sheriff's Office has called a Wednesday news conference to announce "conclusive results" of the investigation. The official spoke to the AP Tuesday night on condition of anonymity because he was not authorized to brief the media.

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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.

See photos from the manhunt that ensued after Charles Joseph Gliniewicz's death:

29 PHOTOS
Illinois Manhunt, Fox Lake Police Lt. Charles Joseph Gliniewicz
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Official: Illinois cop's death will be declared a suicide
FOX LAKE, IL - SEPTEMBER 02: Residents and police from Fox Lake and surrounding communities attend a vigil for slain Fox Lake police officer Lt. Joe Gliniewicz on September 2, 2015 in Fox Lake, Illinois. Gliniewicz was shot and killed yesterday during a foot chase with three suspects who remain at large. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 02: Officers salute as the family of slain Fox Lake police officer Lt. Joe Gliniewicz arrive for a vigil held in his honor on September 2, 2015 in Fox Lake, Illinois. Gliniewicz was shot and killed yesterday during a foot chase with three suspects. (Photo by Scott Olson/Getty Images)
Police officials follow Fox Lake Police Lt. Charles Joseph Gliniewicz's family after a vigil at Lakefront Park to honor him on Wednesday, Sept. 2, 2015, in Fox Lake, Ill. Gliniewicz was shot and killed Tuesday while pursuing a group of suspicious men. Police are searching for a second day to locate three suspects in the killing. (AP Photo/Nam Y. Huh)
A mourner holds a sign during a vigil at Lakefront Park to honor the memory of Fox Lake Police Lt. Charles Joseph Gliniewicz on Wednesday, Sept. 2, 2015, in Fox Lake, Ill. Gliniewicz was shot and killed Tuesday while pursuing a group of suspicious men. Authorities broadened the hunt Wednesday for the suspects wanted in the fatal shooting. (AP Photo/Nam Y. Huh)
Police search from a helicopter for suspects in the shooting of a police officer, Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
This undated photo provided by the Fox Lake Police Department shows Lt. Charles Joseph Gliniewicz, who was shot and killed Tuesday, Sept. 1, 2015, in Fox Lake, Ill. Police with helicopters, dogs and armed with rifles were conducting a massive manhunt Tuesday in northern Illinois for the individuals believed to be involved in the death of Gliniewicz. (Fox Lake Police Department photo via AP)
Members of various police agencies gather as they continue searching for suspects in the shooting of a police officer, Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
CORRECTS TO GLINIEWICZ FROM GLINIEWITZ- Police officers confer while searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 outside Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
A heavily armed police officer walks in a shopping area after searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
Police officers meet up before heading out for a manhunt on Tuesday, September 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers get get a break after coming off a search mission as temperatures exceeded 90 degrees during a manhunt for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in the shooting death of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
CORRECTS TO GLINIEWICZ FROM GLINIEWITZ- A police K-9 team rest after searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
FOX LAKE, IL - SEPTEMBER 01: A police sniper keeps watch from the roof of a home while other police search nearby for suspects involved in the shooting of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police officers looks out across a search area as the manhunt continues for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
Supporters hold signs as police continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewitz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
Supporters hold signs as police continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
FOX LAKE, IL - SEPTEMBER 01: Sisters Brittany (L) and Renee Evans join other residents in showing their support as the manhunt continues for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
Members of local, state and federal police agencies gather as they continue searching for suspects in the shooting of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. Fox Lake Police Lt. Charles Joseph Gliniewicz was shot and killed while pursuing a group of suspicious men. Police with helicopters, dogs and armed with rifles are conducting a massive manhunt in northern Illinois for the individuals believed to be involved in the death of the three-decade member of the department and a father of four sons. (AP Photo/Michael Schmidt)
FOX LAKE, IL - SEPTEMBER 01: A police officer searches an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
A sniper and a lookout stand on top of a roof searching for two men following the killing of a police officer Tuesday, Sept. 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
Police officers search for suspects after a police officer was shot on Tuesday, September 1, 2015 in Fox Lake, Ill. (Joe Shuman/Chicago Tribune/TNS via Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in shooting an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: Police officers search an area for suspects involved in the shooting death of an officer September 1, 2015 in Fox Lake, Illinois. A manhunt for three suspects is underway after an officer from Fox Lake Police was shot and killed this morning. (Photo by Scott Olson/Getty Images)
FOX LAKE, IL - SEPTEMBER 01: A police officer cools down his search dog as temperatures exceeded 90 degrees during a manhunt for three suspects in the murder of a Fox Lake Police officer on September 1, 2015 in Fox Lake, Illinois. Lt. Joe Gliniewicz was found with a gunshot wound shortly after the department lost radio communication with him during a foot chase of three suspects. (Photo by Scott Olson/Getty Images)
Police officers patrol a swampy area where a manhunt is taking place on Tuesday, September 1, 2015 in Fox Lake, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
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A spokesman for the Lake County Sheriff's Office, Christopher Covelli, declined any comment Tuesday evening. The office said in a statement that it would not comment until the news conference.

Gliniewicz, a U.S. army veteran affectionately known as "G.I. Joe," radioed on Sept. 1 that he was chasing three suspicious men on foot. Backup officers later found his body 50 yards from his squad car.

He was struck by two rounds, one that hit his ballistic vest with the force of a "sledgehammer" and another that pierced his upper chest, Lake County Major Crimes Task Force Commander George Filenko said at the time.

After Gliniewicz's shooting, a massive manhunt ensued, with hundreds of officers searching houses, cabins and even boats on a chain of area lakes. Authorities released a vague description of three suspects, though no one was ever arrested.

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. Signs with the officer's picture hung in storefront windows.

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The tattooed officer with a shaved head was described by those who knew him as tough when needed, but also as sweet and a role model to youngsters aspiring to go into law enforcement.

More than 100 investigators stayed on the case for weeks, though questions arose in mid-September, and investigators began to concede that they could not rule out suicide or an accident.

One hint came when Lake County Coroner Dr. Thomas Rudd announced that Gliniewicz was killed by a "single devastating" shot to his chest. That prompted an angry response from Filenko, who said the release of such details put "the entire case at risk."

Gliniewicz's family dismissed the suggestion of suicide. His son D.J. Gliniewicz said his father "never once" thought of taking his own life, and described how his dad spoke excitedly about what he planned to do after retiring.

Gliniewicz had four children.

RELATED GALLERY: See photos from the funeral of Charles Joseph Gliniewicz:

9 PHOTOS
Illinois cop funeral Lt. Charles Joseph Gliniewicz
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Official: Illinois cop's death will be declared a suicide
Jeff Jacobs of the Illinois State Police and Leroy Pugesek of the Lake County Sheriff's Office hug outside the funeral of slain Fox Lake police Lt. Charles Joseph Gliniewicz at Antioch Community High School on Monday, Sept. 7, 2015 in Antioch, Ill. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
Covered in an American flag, the casket of slain Fox Lake police Lt. Charles Joseph Gliniewicz arrives at Antioch Community High School on Monday, Sept. 7, 2015 in Antioch, Ill. The man in the maroon beret is Lt. Gliniewicz's son. Thousands of police officers and residents are expected to attend his funeral later this morning at the school. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
Hundreds of people get in line to pay their respects to slain Fox Lake police Lt. Charles Joseph Gliniewicz at Antioch Community High School on Monday, Sept. 7, 2015 in Antioch, Ill. Thousands of police officers and residents are expected to attend Gliniewicz's visitation and funeral today. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
Ron Flug, foreground, ride captain of the Patriot Guards leads the group to Antioch High School for the funeral of Fox Lake police Lt. Charles Joseph Gliniewicz on Monday, Sept. 7, 2015 in Antioch, Ill. (Brian Nguyen/Chicago Tribune/TNS via Getty Images)
Law enforcement officers salute the casket of Fox Lake police Lt. Charles Joseph Gliniewicz as it is wheeled into Antioch Community High School on Monday, Sept. 7, 2015 in Antioch, Ill. (Brian Nguyen/Chicago Tribune/TNS via Getty Images)
Covered in an American flag, the casket of slain Fox Lake police Lt. Charles Joseph Gliniewicz arrives at Antioch Community High School on Monday, Sept. 7, 2015 in Antioch, Ill. Thousands of police officers and residents are expected to attend his funeral later this morning at the school. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
A memorial is in place at the Fox Lake Police Department on Sept. 2, 2015 in Fox Lake, Ill. Police are searching for a second day to locate three suspects in the killing of Fox Lake Lt. Charles Joseph 'G.I. Joe' Gliniewicz. (Jose M. Osorio/Chicago Tribune/TNS via Getty Images)
Tara England of Ingleside and her 11 year-old son pray in front of the memorial for slain Fox Lake police Lt. Charles Joseph 'G.I. Joe' Gliniewicz on Wednesday, Sept. 2, 2015 in Fox Lake, Ill. Three suspects still remain at large and a manhunt is underway in the area. (Stacey Wescott/Chicago Tribune/TNS via Getty Images)
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