HAYWARD -- A national news program airing Friday will profile how two California parents whose loved ones were murder victims aided the family of Michelle Le, as they searched for the San Mateo woman who went missing in Hayward.

NBC's "Dateline" will examine the contributions to the case by Marc Klaas, whose 12-year-old daughter Polly was murdered in Sonoma County in 1993, and Carrie McGonigle, whose 14-year-old daughter Amber DuBois was slain near San Diego in 2009.

Michelle Le went missing in May 2011 after attending a night nursing class in Hayward. Her remains were discovered less than four months later in Sunol, southeast of Hayward. Giselle Esteban, a Union City woman, was convicted of killing Le and was sentenced to prison for 25 years to life.

Klaas is director of the KlaasKids Foundation, an organization dedicated to finding missing persons. He helped the Le family launch a social media campaign and organize a team of volunteers to search for the missing woman.

McGonigle is founder of Team Amber, a search organization. In mid-September 2011, she was part of a volunteer search team in Sunol, where her dog discovered Le's remains.

The two-hour "Dateline" episode is scheduled to air from 9 to 11 p.m.

Contact Chris De Benedetti at 510-353-7011. Follow him at Twitter.com/cdebenedetti.