Authorities investigate the 2003 murders of four recent high-school graduates, shot in a home in Houston.

Women try to stop Philippe Padieu, an HIV-positive man, from knowingly infecting other women.

La Toya Jackson talks to Barbara Walters about the Jackson family, her impressions of her late brother Michael's children, and why she believes Michael was murdered; the complicated... Full summary

New details on the murder of Jasmine Fiore; a drowning woman is rescued, but the person who saves her dies; mothers who micromanage; health care.

People who drink and drive with their children in the car; Web sites where wealthy older men can meet attractive young women; children who say they can talk with the dead and its effect... Full summary

A massive tornado decimates Parkersburg, Iowa, on Memorial Day weekend 2008, leaving destruction in its wake.

Medical mysteries include a boy born with his heart outside his chest, a severely autistic girl learning to communicate, a mysterious neurological disorder paralyzing women, and a... Full summary

Out-of-control spenders seek professional help; the wife of music producer and convicted killer Phil Spector talks about her relationship with her husband; insurance and whether it... Full summary

Journalist Charles Gibson explores the oil business, including how it works, who makes money and how its fluctuating prices affect average Americans.

Daniel Chappell's wife Jessie is found dead in the desert.