but sergeant tarpley didn't stop there.nterrogation, tarpley asked parker if the name dianna green rang a bell. >> that's when i noticed a change in his whole manner. he seemed to take an interest. he knew a lot about the green case, which i thought was very unusual. he wasn't really talking about the other cases but he said that he had read about that case and he had followed it on the radio and he knew that a marine had been convicted of that case. and that kind of stuck in the back of my mind too. i noticed that got a rise out of him. i kept going after him. >> gerald parker had also been in the marines. after thinking a few minutes, parker told sergeant tarpley that there was something he needed to get off his chest, something that had been bothering him for 16 years. >> you could go out with me and my friends sometime. >> parker said he was outside the greens' apartment on september 30th, 1979, and heard the couple argue. after kevin green left for hamburgers, parker admitted that he entered the greens' apartment with