In October 2007, she was arrested again in the frame of the Riggs Bank case, along with Pinochet's five children and 17 other people (including two generals, one of his former lawyers and his former secretary) on charges of embezzlement and use of false passports.

[6] Hiriart was sued by two Communist Party lawmakers from Chile, Hugo Gutierrez and Karol Cariola, along with the Relatives of Disappeared Detainees Group (AFDD) for misuse of public assets owned by CEMA Chile for misappropriation of public assets, tax fraud, and embezzlement.

During the investigation, Hiriart resigned following a news report from November 2015 stating that she had used sales and rentals of public lands from CEMA Chile for her own benefit.

They had five children – three daughters (Inés Lucía, María Verónica, and Jacqueline Marie) and two sons (Augusto Osvaldo and Marco Antonio).

[1][9][10] Hiriart was portrayed by Gloria Münchmeyer in the 2023 black comedy horror film El Conde directed by Pablo Larrain.