and the amount found in steve robards' body was massive. 28 times the lethal dose. with this news, ft. worth homicide detective thomas bocher went to the university of texas in austin to see marie robards. >> she came out in the hallway and i introduced myself. i told her she was under arrest for the death of her father, steven robards, years earlier. she had no response. there was no reaction. >> and marie quietly went with them, poised as ever. and once they got in that little room, they barely had to ask a question and she confessed and broke down. >> and she was pretty forthcoming with information fairly quickly. she didn't try to hide. she apparently was either guilt-ridden or had thought a lot about what she had done and came forward with the information. >> the most fascinating aspect for both the police and for journalists covering the case was marie's explanation of her motive. >> what was it that made you want to kill your father? and she said, i wanted to be with my mom. >> but in an ironic twist, like something out of a shakespearean tragedy, it was all i