A former Team USA triathlete drowned while going for a swim near his upscale Shelter Island hotel during his family vacation at the Long Island hotspot.

Spencer Korwin, a 38-year-old married Manhattan father of two, was found dead underneath the dock of The Pridwin Hotel just after 3 p.m. Wednesday, the Suffolk Times reported.

Korwin was a guest at the luxury hotel where he was staying with his wife and children when he trekked across the street and into the Shelter Island Sound just before 8 a.m.

Korwin, who is also a wellness entrepreneur, was reported missing when he didn’t return from the water, according to the outlet.

An “extensive…

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