Chopper 7 was over the scene near 4100 S. DuSable Lake Shore Drive about 11 a.m.
That's near Oakwood Beach, just south of Burnham Park.
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A man was seen being pulled from the water. The man was then given CPR by first responders.
Chicago police said Chicago fire crews pulled the man from the water.
He was taken to University of Chicago Medical Center in critical condition.
No one else was hurt, police said.