Authorities said around 1:00 a.m. Officer Jaimie Cox made a traffic stop.
Cox, who started working for the Rockford Police Department in December 2016, was escorted to the Winnebago County coroner's office Sunday morning by police from Rockford and surrounding jurisdictions.
Rockford Police escorted Cox's body from Saint Anthony Medical Center, where he was pronounced dead, to the Winnebago County coroner's office shorty after 6 a.m.
"Officers also located a deceased suspect inside the vehicle that crashed", Rockford Police Chief Dan O'Shea said. Shortly after, Cox called for assistance.
Rockford police have not commented on if the suspect did in fact take Cox's gun.
O'Shea identified the officer as 30-year-old Jaimie Cox. Inside the auto, investigators tell 23 News a body was found.More news: John Wall Says Wizards 'Smell Blood' In Matchup With Cavaliers
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A police officer and another man both died after a single-vehicle crash in northern IL, authorities said.
When the responding officers arrived, they discovered a single-vehicle crash about two blocks away from the initial traffic stop. He previously worked as an officer with the Illinois Department of Natural Resources, according to O'Shea.
Rockford police have not released the cause of death but they believe a shooting occurred. Although, police say there is no danger to the public at this time. He was a graduate of Hononegah High School and Northern Illinois University.
The Rockford Police Department also expressed its gratitude for the outpouring of support is has received.
State Street will remain blocked for several hours while the investigation continues.