At just 18 years old, C.C. Opanowski survived a vicious attack by her ex-boyfriend, Shawn Doyle, a man she once trusted and loved. Doyle pleaded guilty to menacing in the second degree and was sentenced to three years' probation. Opanowski tried to put the traumatic incident behind her until she learned years later that Doyle murdered Lori Leonard, a mother of two young boys. Now, for the first time, Opanowski shares her powerful story with 48 HOURS, speaking out about the attack, her long road to healing and the strength it took to face her attacker in court. Correspondent Anne-Marie Green reports on a case that spans nearly three decades in "Facing a Monster."