CPD and the Cook County Medical Examiner's Office said Krzysztof Szubert was pulled from the water about 1:55 a.m. after being found unresponsive. He was pronounced dead a short time later at Northwestern Memorial Hospital.
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Area three detectives are investigating.
Szubert was working in the Chicago area when he went missing over the weekend.
He was last seen Saturday night at Howl at the Moon, a bar at 26 W. Hubbard St. in River North.
On Tuesday, some of his coworkers posted flyers near the bar.
RELATED: Missing Chicago man last seen at River North bar Celeste on Saturday, family says
Szubert worked IT for Knapp Incorporated, a global tech company.
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He'd been in the U.S. since November, working on a project in Joliet.
That's where he was staying in a hotel.
On Saturday, he and a few dozen coworkers took a party bus downtown Chicago for their company Christmas party.
They ended up at Howl at the Moon. A coworker said he vanished from the bar about 9:30 p.m. or so, and hadn't been seen since.