The former president said his ex-wife died at her home in New York City

Ivana Trump was Donald Trump's first wife. They had three children together: Donald Jr., Ivanka and Eric Trump

"Our mother was an incredible woman -- a force in business, a world-class athlete, a radiant beauty, and caring mother and friend," the Trump family said

She taught her children about grit and toughness, compassion and determination," the family said

As Eric Trump walked out of his mother's apartment building Thursday afternoon, he told reporters, "It's been a very sad day."

Manhattan paramedics, responding to a call for cardiac arrest, found a 73-year-old woman in the Upper East Side apartment

Ivana Trump was found unconscious and unresponsive at the bottom of a set of stairs in her apartment, according to police sources

Ivana Trump, born Ivana Marie Zelníčková, grew up under communist rule in the former Czechoslovakia