Mariska Hargitay revealed in a new documentary that her biological father is not Mickey Hargitay, the man who raised her, but rather singer Nelson Sardelli.

Mariska Hargitay was 3 years old when her mother, actress Jayne Mansfield, was killed in a car accident in 1967. The mother of five, who was compared to Marilyn Monroe, was 34.

Olivia Benson isn’t the only one who can uncover family secrets. Law and Order: SVU star Mariska Hargitay reveals in her new documentary, My Mom Jayne, that Hungarian actor and bodybuilder Mickey Hargitay is not her biological father.