Neither. Based on available fact we don't know what happened yet.
...
My feeling is that this suicide theory is a conspiracy-type thing.
ETA: After reading the article it seems likely this ex-cop is a nutter, as least as far as I can tell based on his actions.
Maybe you're right. We'll see.
http://www.dailyherald.com/article/20150916/news/150919109/"The son of Fox Lake police Lt. Charles Joseph Gliniewicz threw his full support behind Lake County investigators and their two-week effort to catch three suspects sought in the veteran police officer's shooting death, but he says emphatically that his dad didn't die at his own hand.
"My father never once had a single suicidal thought in his life," Donald "D.J." Gliniewicz said Tuesday.
The younger Gliniewicz said his family is upset over questions raised by Lake County Coroner Dr. Thomas Rudd about whether "Joe" Gliniewicz died from anything other than a homicide, and the unauthorized release of information in the case.
..."
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http://www.foxnews.com/us/2015/09/16/authorities-investigating-possibility-suicide-in-shooting-death-ill-police/"Fox News first reported last week that two sources close to the case say evidence suggests that Gliniewicz, 52, a 30-year veteran of the Fox Lake, Ill. police force, could have shot himself, despite the original characterization of his death as an execution-style murder by police. Authorities say that while they continue to actively investigate the case as a homicide, they say they aren't ruling out suicide."
"Sources tell Fox News two shell casings were found about 100 feet apart from each other near Gliniewicz’s body, which was discovered face down. His hand was in a gun position, the firearm “dropped at his body.”"
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http://fox6now.com/2015/09/06/its-been-very-tough-family-members-friends-strangers-prepare-to-say-goodbye-to-lt-joe-gliniewicz/"Gliniewicz was on his way to work Tuesday morning, in the cruiser that he had taken home the day before, when he saw three suspicious people.
The lieutenant made the first call at 7:52 a.m. and called three minutes later to request backup. The backup units arrived at 8:01 and found their fellow officer dead, roughly 50 yards from his vehicle, at 8:09."
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http://www.washingtonpost.com/news/morning-mix/wp/2015/09/16/that-illinois-cop-killing-sparked-outrage-and-a-tears-but-was-it-a-suicide/"Citing multiple unnamed individuals, the Chicago Tribune reported that detectives are now determining whether Gliniewicz shot himself. Fox News reported similar information, citing “a source who is a member of the task force” investigating the killing."
"Despite the massive manhunt, however, authorities never caught a trace of the three men — two white, one black — Gliniewicz mentioned moments before his death. Stranger still, the three men have been downgraded since then to mere “persons of interest,” instead of suspects, although officials won’t say what evidence prompted the change."
"Finally, there are Tuesday’s media reports, which appear to back Battaglia’s claims by suggesting that Gliniewicz killed himself and staged the suicide to look like a murder."
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http://www.everyjoe.com/2015/09/16/news/did-illinois-cop-gliniewicz-kill-himself/"While the police continues to treat Gliniewicz’s death as a homicide, sources close to the matter have alleged that the veteran officer killed himself."