Off-duty St. Louis police officer Isabella Lovadina put her bulletproof vest and pistol in her car and turned to give her then-boyfriend, Nick Koenig, a goodnight hug. A heartbeat later, two men approached with guns, intending to rob them. Lovadina couldn't stop it. The botched robbery and home invasion left her grievously wounded, Koenig with a bullet in his throat and one woman dead. Lovadina relives the harrowing night in a powerful edition of 48 HOURS MYSTERY entitled "LIVE TO TELL: An Officer and a Hero,".