to the torrance police department concerning thefts of cash from the safe. >> two thefts from the very same safe where robin had left the money, and though they couldn't exactly prove he did it, marshall was a suspect. he had the opportunity. he failed the polygraph when questioned about those previous robberies. and at the time, he knew the combination to the safe. so the night robin was killed, did marshall intend to rob that safe again? >> he knew the previous combinations. i don't believe he was aware they had changed it because it had happened just recently, several days earlier. >> so now detectives brought marshall in for questioning, and he was friendly, cooperative, said he was home the entire evening. and he could prove it, he said. all police had to do was go ask his girlfriend, yvonne hargrove, so, of course, without telling her why they were talking to her, they did ask. >> i told them william was with me that night, because that's what they wanted to know, and what did we do. i said we cooked spaghetti