Dennis Shields, 51, was found unconscious and unresponsive in his Trump Tower apartment on Fifth Ave.in Midtown around 10 a.m. Medics said he was dead at the scene.
His assistant reportedly administered Narcan in an unsuccessful attempt to revive him.
TMZ sources say it may have been oxycodone, but "Extra" has learned the NYC Medical Examiner will determine the cause of death and the investigation is ongoing.
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The two had been dating for 2 years but had known each other for almost 30 and reportedly remained close.
Bethenny Frankel and Dennis Shields are seen leaving SoHo House on June 14, 2016 in New York, New York.
In May, the reality TV star told Steve Harvey that their relationship was complicated, according to People. After one fan said that Bethenny "needs like 12 prozac and a year long nap" because she acts like a child "who is well past their bedtime", Carole brought up "that PSA "It's 10pm, do you know where your children are?..."
The real tragedy is, of course, Dennis's untimely death. Dennis was, and will always be, the love of my life. "We're trying to really kind of be good partners and be good teammates and I think relationships oddly are - and this sounds cold - but a little bit like business". "If both people aren't happy about it but slightly uncomfortable and giving up something or giving in [to] something, it doesn't work".