The Cook County medical examiner's office said the officer suffered an apparent self-inflicted gunshot wound.
Six squad car and several unmarked police cars were parked outside the single-story brick home as uniformed and plainclothes officers stood in the driveway to the west side of the home. About 7:45 a.m., a fire truck pulled up at the home but soon left.
Police at the scene referred all questions to police news affairs. A supervisor said the situation was particularly emotional because many who had responded, including herself, had worked with the officer.
Neighbors stood outside their homes and asked what had happened. They described the neighborhood as a quiet one where many police officers live. At least three other officers live within a block of the home.