Mariska Hargitay is blowing the lid off a family secret that she’s been holding onto for decades and makes the big reveal in a new documentary focused on her bombshell mother, the late-actress Jayne Mansfield.

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.

Mariska Hargitay, Jayne Mansfield's daughter, reveals her biological father is singer Nelson Sardelli, not Mickey Hargitay, the man who raised her.