Officer Jaimie Cox started working for the Rockford Police Department in December 2016.
Rockford police have not commented on if the suspect did in fact take Cox's gun.
A Rockford police officer was killed along with another person in a shooting which led to a crash after a traffic stop. Shortly after, Cox made a radio call for assistance.
"Our thoughts and prayers are with Jamie, Jamie's family and his wife", O'Shea said.
Rockford officers reacting to the scene discovered Cox, who was fundamentally harmed, close to a solitary vehicle crash around two pieces north of the underlying traffic stop, O'Shea said. Inside the vehicle, investigators tell 23 News a body was found. He served in the United States National Guard and was a graduate of Hononegah High School and Northern Illinois University.
He beforehand filled in as an officer for the Illinois Department of Natural Resources, O'Shea said. Police have not identified that person or indicated the cause of death.
The Rockford Police Department also expressed its gratitude for the outpouring of support is has received.
Authorities say a police officer and another man were both found dead at the scene of a single-vehicle crash in northern IL. He was transported to OSF St. Anthony Hospital, where he later died.
"We don't feel the public's at jeopardy", O'Shea said at the briefing.
The area around State Street, Alpine Road, Dawn Avenue, and Turner Street are blocked off as the investigation continues.