CHICAGO (CBS) — A nighttime group swim turned deadly after one person drowned early Wednesday.

Police responded to the 1000 block of North Lake Shore Drive around 4 a.m. after the group lost track of one of their friends.

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An adult male was pulled from the water near Oak Street beach and was transported to Northwestern Memorial Hospital, where he was pronounced dead.

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Witnesses told CBS 2 that five people went into the lake for a swim.

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The man was later found floating in the water.