of her head -- holding her face underwater until she no longer moved. >> it was the same story lillian kingen back in san saba. she'd been there. she said when the caretaker was killed and stood idly by while carl killed his grandmother. but in lillian's telling of the story, she could have very well been carl pressley's third murder victim that day. >> he had three knives on him. three. you know, so i had to do what he said. >> what had driven carl pressley to kill one of the few people on earth who had ever loved him? that was a question to which no one could supply an answer. >> she doted on carl. >> she did dote on him. no one could quite understand why. >> and i'll bet she couldn't in the last four or five hours of her life. >> yeah. yeah. investigators didn't know why carl pressley killed his grandmother. but they were pretty sure there was more to this murder than met the eye and that there could be clues in the harkey family history. >> coming up. a million-dollar inheritance. a neighbor from hollywood. and a harkey with a handful of ex-wives. >> he's just a solid jerk. >> just cons