A doctor is suspected of murdering another physician.

The 2005 murder of 73-year-old millionaire Charlie White Sr. in Horseshoe Bay, Texas, is investigated. The chief suspect is the victim's son Darin.

The 1987 murder of Peggy Hettrick in Colorado is investigated. The probe centers on whether Tim Masters, who was imprisoned for the crime, is guilty or not.

The 1995 double murder of Donnah Winger and Roger Harrington in Springfield, Ill., is investigated. Lesley Stahl is the host.

The 2006 murder of Barbara Mullenix in Huntington Beach, Cal., is investigated. The victim was stabbed more than 50 times and her body was dumped in Newport Harbor.

A widow whose late husband was in the Air Force fights to prove his death was no accident.

A report on the murder trial of Amanda Knox in Perugia, Italy. Knox is accused of the November 2007 killing of her British roommate, Meredith Kercher.

The 2004 murders of Tom and Jackie Hawks off the coast of Newport Beach, Cal., are the focus. The victims disappeared from their yacht while showing the boat to a potential buyer.

Esther Reed, a con artist who assumed the identities of several people to gain admission to select Ivy League schools and collect student-loan money, is interviewed following her 2009 sentencing for fraud and identity theft.

A brother and sister are at odds over their stepfather's murder.