Summary 48 Hours correspondent Peter Van Sant investigates the case against Megan Hargan who was suspected of killing her mother Pam Hargan and her sister Helen Hargan. When investigators entered the McLean, Virginia home of millionaire mother Pam Hargan, they discovered the bodies of Pam and her youngest daughter Helen Hargan, who was found dead with a rifle. Hours later, police told the family that Helen's wound looked self-inflicted, and that it was probably a murder-suicide. Did Helen Hargan shoot her mother dead and then take her own life? Her sister, Megan Hargan, told investigators Helen Hargan had been struggling emotionally. Megan's defense strategy had an unusual theory: that her sister Helen killed their mother and then killed herself with her toe on the trigger.

• Crime
• Documentary