This story from WGN TV says he was shot with his own weapon:
http://wgntv.com/2015/10/01/9-unidentified-dna-samples-found-where-fox-lake-officer-died/
“The lead investigator revealed on Thursday the fallen officer was shot twice with his own weapon, and there were signs of a struggle at the scene. The first shot knocked him out, and the second one is believed to have killed him. No word, though, on how the gun went off.”
Thanks. Now I recall more reported details of this case.
Very odd. This was the one with no known body camera, no dash cam. Did they ever reveal anything about his personal life or personal issues?