Shields, who made frequent appearances on Bravo's "The Real Housewives of New York City", on which Frankel stars, was reportedly found dead in his apartment in New York City of a suspected overdose.
Police responded to a 911 call of an unconscious man inside Trump Tower about 9:19 a.m., officials said in a press release.
Before entering into a relationship following Frankel's contentious divorce from ex-husband Jason Hoppy, the two knew each other for almost 30 years.
"We are all heartbroken. Please respect our family's privacy at this time".
The real tragedy is, of course, Dennis's untimely death.
When the pair first started dating, "RHONY" cast member Luann de Lesseps criticized their relationship during the Season 8 reunion, telling Frankel: "Everybody knows that you're going out with a married man!" The relationship had many splits and makeups.
According to a new report, Dennis was found dead in his home, at the Trump Tower, at the age of 51. Earlier this year, Frankel opened up to Steve Harvey about their complicated relationship. "It's like a partnership where if we're not being teammates and it's not working and one man is down, then the other man is down. So both partners have to say, 'All right, I'm in it for this'". "I haven't said that to anyone yet".