Medical examiner's office identify the body as that of 51-year-old Dennis Shields who had an on-off relationship with the star.
Police are investigating the suspected overdose death at Trump Tower of a man romantically linked to reality TV star Bethenny Frankel.
The New York City medical examiner's office has identified the man as Dennis Shields.
Mr Shields, 51, had been known for being the on-off boyfriend of Frankel, who shot to fame as a star of The Real Housewives of New York City.
Police responding to an emergency call say they discovered the body shortly after 9am on Friday at Donald Trump's high-rise on Fifth Avenue.
The New York Post reported that Mr Shields was living at Trump Tower at the time of his death.
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An emergency medical service team pronounced Mr Shields dead at the scene.
Frankel went to high school with Mr Shields' estranged wife.