A body was pulled from Lake Michigan on the North Side on Monday morning.

The police Marine Unit responded to a report of someone in the water in the 3600 block of North Recreation Drive at 9:40 a.m. and discovered a person unresponsive, according to Chicago Police.

The person has not yet been identified, according to the Cook County medical examiner’s office. An autopsy Tuesday found the person drowned, and heart disease was listed as a contributing factor. The death was ruled an accident.