She was only 33 years old.
"The sudden death of Queen Máxima's sister comes as a big shock".
Queen Maxima, 47, has reportedly cancelled all of her upcoming engagements and is due to fly to her native Argentina later today.
This photo relesead by Telam on June 07, 2018, shows Ines Zorreguieta, the youngest sister of Argentine-born Maxima Zorreguieta, now queen of the Netherlands, attending the baptism of Princess Ariane on October 20, 2007 in The Hague, Netherlands.
Zorreguieta was found dead in her apartment in Buenos Aires.
Dutch Prime Minister Mark Rutte issued condolences to the royal family, calling the loss "a great shock".
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'I wish them all the strength they need to cope with this frightful loss. Although no additional details surrounding her tragic death were provided, it has been reported that she was known to suffer from depression.
The father of Inés and Maxima, Jorge Zorreguieta, served as agriculture minister during Argentina's brutal military dictatorship and died past year of Hodgkin's lymphoma at 89.
Maxima had a close relationship with her youngest sister, who was a bridesmaid at her wedding to Willem-Alexander, and a godmother to Ariane, the third child of the Dutch royals. The government said state visits to Latvia, Estonia, and Lithuania will go ahead as scheduled, but King Willem-Alexander will not be joined by Maxima.
It's believed Zorreguieta took her own life.
Ms Zorreguieta studied psychology at a university in Argentina and worked for the government there as an official in the Ministry of Social Development.