Chicago police sergeant dies after being found unresponsive at Northwest Side station

A Chicago police sergeant died Tuesday after being found unresponsive at a police station on the Northwest Side, officials said.

The sergeant, identified as 49-year-old Timothy Martin, was on duty when he was found around 1:14 p.m. at the Albany Park District station, 4650 N. Pulaski Road, according to the Chicago Police Department and the Cook County medical examiner's office.

Martin was taken to Illinois Masonic Hospital, where he was pronounced dead.

The medical examiner's office hasn't ruled on the cause and manner of his death.

This is a developing story. Check back for updates.