SVU' star talks about her movie star mother Jayne Mansfield in "My Mom Jayne" and her once-secret biological father Nelson Sardelli.

I couldn’t believe that this truth, this bombshell for me, didn’t ever come to light," says the ‘Law & Order: SVU’ star about going public with her biological father’s identity in an HBO documentary on her mother,

In her debut as a documentary director, Mariska Hargitay explores the life of her mother, the Hollywood actor Jayne Mansfield, who died at 34.