The NYC medical examiner will determine the official cause of death.
Frankel and Shields had been in an on-off relationship since 2016, but knew each other for more than 20 years. Shields had appeared on Frankel’s reality show, “The Real Housewives of New York.”
Shields was previously married to Jill Schwartzberg.
CNN’s Mark Morales and Julian Cummings contributed to this report.