bobby lowe have to want deede either dead or out of the picture? >> there was no motive that i could determine, whatsoever. >> and lowe provided investigators with two important clues. first he said, while he was at deede's that night, the dogs had all started barking at something outside. as if someone were lurking. and the next morning, he discovered someone had keyed the side of his ford explorer. leaving a long scratch. we suggest what? somebody is following them on that date? >> absolutely. that's what it meant to me. >> but who was following deede and bobby? who was that angry? that act of vandalism pointed away from bobby lowe. >> i was an investigator for several years. i've never known anybody to vandalize an old car. >> that kind of thinking is what makes a perfect ally. >> sure. sure. if he sophisticated and the. but his background indicated