Mariska Hargitay’s new documentary, “My Mom Jayne,” reveals heartbreaking new information about the night her mother Jayne Mansfield died. While shooting her directorial debut, the “Law & Order: Special Victims Unit” star learned how she was accidentally left behind at the scene of the car crash which killed her mother and two other people.

Mariska Hargitay is making her feature film directorial debut with her new documentary, “My Mom Jayne.” Screengrab from @therealmariskahargitay's Instagram. Mariska Hargitay’s new documentary tells her story just as much as it tells her mom’s story.

"I'm in a profound moment of gratitude for my family," Hargitay said at the Tribeca Festival premiere for the documentary she made about late mom Jayne Mansfield.