Story highlights
Homeowner described three men walking past the camera, task force commander George Filenko says
“We have retrieved … what we believe to be some significant video,” investigator says
Detective: A woman was lying when she said she saw 2 suspicious men go into a cornfield

Any video in the area could help authorities determine who shot and killed Fox Lake police Lt. Joe Gliniewicz on Tuesday morning. Until now, police have described the suspects only as two white men and a black man — descriptions of people that Gliniewicz had indicated he’d encountered shortly before the shooting.
A homeowner in Fox Lake, a community of about 10,000 people in northern Illinois, turned over his surveillance video after telling police that he saw three people in the area, Lake County Major Crime Task Force commander George Filenko said.
Local investigators don’t have the proper equipment to see the recording, so the footage was given to a nearby Department of Homeland Security office, and police hope to learn what it shows soon.
Filenko told CNN’s “Erin Burnett OutFront” that the person who recorded the video said there were two white men and a black man walking past the camera. He said the video was recorded within the area where Gliniewicz was killed.
“Again, we don’t believe in coincidences. However, we still don’t know and I can’t verify exactly whether this video is relevant to the case,” Filenko said. “But at this point it’s probably one of the most significant ones we’ve recovered.”

Meanwhile, a source involved in the investigation told CNN that Gliniewicz’s gun was fired on the morning, though it’s not clear who discharged the weapon.
The gun was recovered at the crime scene, the source said on condition of anonymity.
It’s not clear how Gliniewicz’s gun figures into the killing. Police have declined to answer questions about whose gun was used to kill him.
Filenko wouldn’t confirm that the weapon found was the officer’s gun.

The last day of work
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, Filenko said earlier this week.
This would not have been unusual as Gliniewicz was the type of officer who considered himself on duty as soon as he rolled into town, Filenko said.

The lieutenant made the first call at 7:52 a.m. and called three minutes …Read More