up the ranks the homicide attacked, it was even assigned to protect president mixing. he had heard about kits murder in 1980, three but by then, he had worked in the da's office, where he retired in 95. so, what was he doing snooping around -- in 1999. simple, boyd wasn't the retiring type. he came back to work a new unit in the orange county da's office. his mission, revisit cold cases, and close them. here he was, the last chance for justice. but, then something caught his bag. >> the criminals at that time had identified a -- plastic back is being human blood, was not the same type of blood from the victim. >> in fact, in the early 80s, that's all science could tell