In a morning news briefing, Rockford Police Chief Dan O'Shea says the incident occurred shortly after 1 a.m.
Cox joined the department in December 2016, officials said.
Cox was rushed to OSF Saint Anthony Medical Center in Rockford, O'Shea said, where he was pronounced dead.
"Officers also located a deceased suspect inside the auto that crashed", Rockford Police Chief Dan O'Shea said. He called for assistance a short time later. Inside the crashed vehicle, officers found 49-year Eddie Patterson dead.
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ROCKFORD, Ill. (WIFR) - Rockford Police say an officer was shot early this morning on the city's east side.
About two blocks of where the initial stop was made a deceased person was found inside of a wrecked vehicle.
"Our thoughts and prayers are with Jaimie, Jaimie's family and his wife", O'Shea said. Inside the auto, investigators tell 23 News a body was found. Police have not identified that person or indicated the cause of death. He previously worked as an officer with the Illinois Department of Natural Resources, according to O'Shea.
Rockford police have not confirmed if the suspect did in fact take Cox's gun.
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Police have not said how Officer Cox died.
O'Shea said although roads are still closed near the scene, the public is not in danger. He served in the United States National Guard and was a graduate of Hononegah High School and Northern Illinois University.
State Street will remain blocked for several hours while the investigation continues.
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