Ivana Trump dies at 73. What's the cause of her death?

Ivana Trump, the mother of Ivanka, Eric, and Don Jr. and the ex-wife of former President Donald Trump who was a Czech American, passed away on Thursday.

Officers responded to a report at her Upper East Side apartment at about 12:40, a New York Police Department official said AFP in an email (1740 GMT).

According to police sources, Ivana Trump was found unconscious and unresponsive at the stairs at her apartment.

Authorities think she had a cardiac arrest, but the precise cause of death is still unknown.

The police were looking into whether she fell down the stairs at her Manhattan residence, however the actual cause of death is not known.

The statement said, "There does not appear to be any crime," and the cause of death would be determined by the city's medical examiner.

In 1977, Ivana Trump, a model who was born and raised in the former Czechoslovakia under communist government, wed Donald Trump, who was just starting out as a real estate developer.

On Thursday, Eric Trump shared a homage to his mother, who had a successful skiing career as a child in Eastern Europe.