The former president said Thursday that Ivana Trump had died at her home in New York City. She was 73.
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 in a statement.
"Ivana Trump was a survivor. She fled from communism and embraced this country. She taught her children about grit and toughness, compassion and determination," the family said. "She will be dearly missed by her mother, her three children and ten grandchildren."
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 where Ivana Trump lived just after 12:30 p.m. Thursday, according to the FDNY. She was pronounced dead at the scene, the NYPD said.
Ivana Trump was found unconscious and unresponsive at the bottom of a set of stairs in her apartment, according to police sources. The police were investigating whether she fell and, if so, whether the fall contributed in any way to her death, the sources said.
On Friday, the medical examiner said her cause of death was blunt impact injuries to the torso sustained as the result of a fall. The manner of death is an accident and is not suspicious, the medical examiner said.
In a statement on his platform Truth Social, the former president remembered Ivana as a "wonderful, beautiful, and amazing woman, who led a great and inspirational life."
"Her pride and joy were her three children, Donald Jr., Ivanka, and Eric," he wrote. "She was so proud of them, as we were all so proud of her."
Ivanka Trump remembered her mother as "brilliant, charming, passionate and wickedly funny."
"She lived life to the fullest -- never forgoing an opportunity to laugh and dance," Ivanka Trump said on Twitter while sharing a childhood photo of herself with her mother. "I will miss her forever and will keep her memory alive in our hearts always."
Ivana Trump, born Ivana Marie Zelníčková, grew up under communist rule in the former Czechoslovakia. She left in the 1970s and married Donald Trump in 1977.
She worked for years in Trump's business empire as a senior executive. She was appointed CEO of Trump's Castle, one of his hotel casinos in Atlantic City, and helped design interiors for the Grand Hyatt Hotel and Trump Tower. She also authored multiple bestselling books and created her own clothing line.
"No matter how busy I was, I had breakfast with my children every day. I sat with them at dinner every night and helped them with their homework (I loved algebra) before going out in a Versace gown to a rubber-chicken charity event," Ivana Trump wrote in her memoir, "Raising Trump." "The kids and I celebrated, traveled, and grieved together. Our bond was, and is, our most valuable possession."
Ivana and Trump divorced in 1992. Their marriage dissolved amid revelations that the former president was having an affair with Marla Maples, who would become his second wife.
In a 2017 interview with ABC News' Amy Robach, Ivana Trump said she had forgiven her former husband. She also described the formative years of raising her children with Donald Trump.
"He was a loving father, don't get me wrong, and he was a good provider, but he was not the father which would take a stroll and go to the Central Park or go play to baseball with them or something," she said. She added, when they "were about 18-years-old," "he could communicate with them, because he could start to talk business with them."
This is a developing story. Please check back for updates.