parker described how he struck dianna green. was the man kevin green saw outside his apartment on the night of the assault. >> parker was a marine, green was a marine. and there was that little marine corps bond. >> sergeant tarpley personally delivered the news of parker's confession to kevin green. >> for a moment, i was just overwhelmed. i actually slumped in my chair and tom has described it as i started crying. i don't remember that. it's possible. >> the semen sample from dianna green had not been kept refrigerated in the 16 years since the trial but it was sent for dna testing anyway. scientists used a process called pcr, which can analyze tiny bits of dna, even samples which are badly degraded. the semen recovered from dianna green matched gerald parker. ironically, the dna technology which exonerated kevin green had been available for 12 of the last 16 years of his incarceration. just hours after the dna test, kevin green was released from prison after 16 long years. >> oh, kevin. today, gerald parker sits on death row.

>>> in 1979, dianna green was in the first year of marriage to kevin green, a 21-year-old marine stationed at the el toro ta