SAN DIEGO (CBS 8) - A new online petition is sparking renewed interest in an old, unsolved murder mystery.

It's been 34 years since 15-year-old Barbara Nantais was killed at Torrey Pines State Beach. Her family and friends are now pleading with the San Diego Police Department to allow a private group of investigators to take a look at the cold case.

Watch the video for more on this story.

WARNING: Some details in this story may be disturbing.