A 49-year-old woman was pronounced dead after being pulled from the North Branch of the Chicago River in the North Park neighborhood, officials said.
The call came in at about 12:27 p.m that a person had gone into the the river at 3035 W. Foster Ave., police said.
The woman was found by divers and she was taken to Swedish Covenant Hospital in critical condition but was later pronounced dead, officials said.
The woman was identified as Brenda Penn, according to the Cook County medical examiner's office. The office said the woman was apparently homeless.
Members of the marine unit along with Chicago Fire Department personnel responded to the call.
Chicago Fire Department Spokesman Larry Langford said some reportedly saw a woman go into the water but they did not see the woman resurface.
An autopsy is scheduled for Monday.