Richard Duroseau, a musician from East Meadow, was last seen leaving Nassau University Medical Center on Friday.
He was last seen wearing a dark gray jacket, pressed pants, a dress shirt and a tie. He is 5-foot-6 and 140 pounds. He has numerous medical conditions and may be in need of medical attention.
The alert includes all of New York City and Long Island as well as Westchester, Putnam, Rockland and Orange counties.
Anyone with information should call (516) 573-7347 or 911.
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