The officer has been identified as 42-year-old Durand Lee, according to the Cook County Medical Examiner's Office.
The 5th District officer was found dead inside his residence in the 1st District, Chicago police spokesman Tom Ahern said.
"Please keep this Officer's family in your thoughts and prayers during this difficult time," Ahern said.
There was a procession from the home to the Cook County Medical Examiner's Office Friday morning.
An investigation into the death continues.
Further details were not immediately available.