the day that daniel purchased those gloves. >> reporter: that was huge -- real evidence linking daniel to the crime scene. >> when all these facts comes together, there's no other suspect. and the reason that shelley was killed is because she stood in the way of a romantic rendezvous that he so desperately wanted with nathan. >> reporter: on november 4, 2009, eight weeks after shelley's murder, they arrested daniel willyam. the arrest was, for shelley's family, a double-edged thing. they were relieved, of course. but until then, the police had not told them that shelley had been stabbed 42 times. >> oh, my god. i almost passed out. 42 exact. and i just thought, "oh my god." >> reporter: prosecutor dewey mitchell got the case then, and right away could see the problem. this was a circumstantial case, in which the accused would likely say, the other guy did