In 1977, Christa Helm was a model turned actress whose Hollywood story came to a bloody end. She left behind a trove of scandalous secrets, a long list of high-profile suspects, and a daughter who’s been searching for the truth ever since. "48 Hours" correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 10/4/2008. Watch all-new episodes of “48 Hours” on Saturdays and stream on demand on Paramount+.