The officer, identified as Jamie Cox, made a traffic stop in the area of State Street and Dawn Avenue at about 1 a.m.
Officer Jaimie Cox started working for the Rockford Police Department in December 2016.
Cox was taken to Saint Anthony Medical Center in Rockford, where he was later pronounced dead, O'Shea said.
A Rockford Police officer has died following an early-morning accident Sunday, according to Rockford Police Chief Dan O'Shea.
Rockford police are cautious to say whether or not Cox was shot to death.
"Our thoughts and prayers are with Jaimie, Jaimie's family and his wife", O'Shea said.
Officers responded to find Cox critically injured, as well as a single-vehicle crash two blocks north.
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Chief O'Shea told the media that one other person was found dead inside the vehicle located at the scene.The investigation remains active. He was a graduate of Hononegah High School and Northern Illinois University.
Around 1:20 a.m., Rockford police posted on Twitter and Facebook that the department was "on scene of a shooting involving an officer".
Cox died at a local hospital.
O'Shea said Cox became "entangled" with the vehicle and fired a shot, but he declined to say how either man died or to provide additional details.
Cox was married. The Rockford Police Department did not disclose if any arrests have been made as of early Sunday.
Roads are blocked off in the area and police are not letting anyone through the perimeter they have setup.