he told the court he'd seen a green van with a mysterious woman inside it around the time of the murder, but the tip seemed to be one of those investigative red herrings. >> i did not then nor do i now believe that that van was involved in this murder. >> instead the prosecutors said the evidence gathered in the months after the murder showed that the killer was far from a nameless intruder. it was, in fact, someone who knew paul duncsak well and plotted his death carefully. >> what we have here as a search string is how to commit a perfect murder. >> a forensic expert provided damning testimony against the defendant. he explained how a computer used by edward ates and later seized by police yielded the ghosts of past online searches. >> is it true that on the hard drive they found a search asking the question, how do you commit the perfect murder? >> that is true. he researched how to pick a lock and purchased a lock pit set. he researched silencers, and he