The Lake County coroner has not yet classified the death as a homicide and important details about how Lt. Gliniewicz was killed are being kept under wraps.
On Wednesday night, as a guest on a friend's online talk show, D.J. Gliniewicz spoke of his late father.
"He came off as kind of having a harder exterior with his military background and law enforcement background, but he would definitely want everyone to know that family is all you have," D.J. said.
The second-oldest of four sons, D.J. served as his father's pallbearer on Monday as thousands turned out to pay final respects.
PHOTOS: Memorial services held for Lt. Joe Gliniewicz
"I just want to thank people from all over the world coming in and everything like that to support my father," D.J. said.
The appearance comes more than a week after Lt. Gliniewicz was found shot to death in a remote, industrial area. How it happened still a mystery.
Lake County Coroner Thomas Rudd told Eyewitness News on Wednesday that Lt. Gliniewicz died from a "single, devastating wound" but declined to say where he was shot or how many times.
Gliniewicz initially radio'd that he was pursuing three suspicious men, but investigators say they've found no surveillance video showing the suspects.
"Still on edge. There's no closure here for any of us in town," said Kathy Schriver, a Fox Lake resident.
"People feel lost right now. Our town lost a great man. Lost a hero," said Tammy Rivette, another Fox Lake resident.
In McHenry, a community once again pitched in Wednesday night by hosting a screening of the film "Superman" to raise money for the Gliniewicz family.
"Words really can't even describe the emotions and everything like that, especially being able to see the community as a whole coming together and support our family," D.J. said.
Perhaps the most significant piece of evidence in the investigation is DNA that was found at the crime scene. Authorities say it does not belong to Lt. Gliniewicz, but there's been no word of any match at this point.