Gilgo Beach serial killer Rex Heuermann pleads guilty to eight murders spanning three decades, ending a 30-year investigation that haunted Long Island. A Hawaii anesthesiologist is convicted of attempted manslaughter, and a former prosecutor explains what reasonable doubt means in jury trials. Rex Heuermann pleaded guilty to murdering seven victims and admitted to an eighth murder, with overwhelming DNA evidence including hair matches on duct tape used to bind victims. Dr. Gerhard Konig was found guilty of attempted manslaughter after claiming self-defense during a cliff-top struggle with his wife, who sustained severe head injuries requiring hospitalization.