Northern Illinois authorities say they have received the results of gun residue and ballistics tests conducted in the investigation into the shooting death of a Fox Lake police officer earlier this month.
Lake County Sheriff's Office spokesman Christopher Covelli says the results do not support or exclude any theory in the death of Lt. Charles Joseph Gliniewicz.
Covelli on Monday refused to provide any of the test results. He said divulging the findings would make it harder to assess if would-be suspects at any future interrogations were telling the truth.
Covelli went on to describe the investigation as "very complex." This comes after he was criticized by sheriff officials for prematurely releasing autopsy findings.
Authorities have made no arrests or identified suspects in Gliniewicz's death. The lack of public pronouncements has raised concerns about the investigation, including whether there's a killer on the loose.
