CHICAGO (CBS) — A 59-year-old man died Wednesday morning after driving his SUV into Jackson Park Harbor.

The SUV left the road at Marquette and La Rabida drives, went down a hill at the entrance to La Rabida Children’s Hospital, and plunged into the outer harbor at Jackson Park around 5:40 a.m.

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The vehicle ended up about 30 to 40 feet offshore.

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The 59-year-old man who was driving the SUV was pulled out of the water and taken to the University of Chicago Medical Center in critical condition. He later was pronounced dead.

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It was not immediately clear what caused the crash. Police said it was under investigation.