A man who lost 400 pounds and gained a new life, a bald model who wins beauty pageants, a man with an idea that catapulted his financial worth into the stratosphere, a wife who stunned her neighbors -- and her husband -- when she fell in love with another woman.

The question of who murdered a Fayetteville, North Carolina military wife and two of her young daughters in their own home, leaving only one toddler alive, seemed to be answered with the conviction of a soldier who was a husband and a father himself. But years later that verdict was overturned and the original suspect, Tim Hennis, was acquitted. Then, after two decades of freedom, dramatic new evidence points back to Hennis. Elizabeth Vargas reports on a murder mystery that played out over 25 years... and came to a surprise ending in a North Carolina courtroom this past April.