vickie in september 1986 and dolores davis. >> after he married dolores davis he went silent for a long time. >> reporter: life went on for the raider family, kerry going off to college and meeting her future husband. >> he just seemed like another regular wichita dad to me. >> and then in 2003 my dad walked me down the aisle at our wedding. >> reporter: in 2004, a local paper writes an article about the 30th anniversary of the first btk killings. >> and we include in there that nobody remembered him, which invoked his ire. >> this morning we have more information on the letter sent to the wichita eagle by the btk killer. >> btk started sending packages with mementos from his crimes. >> reporter: one of those boxes contained a floppy disc. >> we got into the meta data, and it showed that it had been typed on by a computer at a church in park city. the name of the computer was register the to the name of dennis. >> reporter: investigators found the church president was denis rader. they also had an old dna sample from the first 1974 crime scene. >> overnight we called 200 police men. we

vicky wegerle in september 1986 and dolores davis. >> my mother was a loving person. friends and really no enemies. >> dolores' house has obvious signs of an intruder making entry into the back of the house. they'd used a cinderblock and threw it through a sliding glass door. >> she's, of course, going to be immediately up running out there. that's when she sees him, the monster standing there. >> he'll kill her in the residence, and he will remove her body. >> he ends up dumping dolores davis out in sort of a culvert by a bridge. >> my mother had been a beautiful person inside and out, and she's disregarded like a bag of garbage. >> several days later she's found by a boy walking a dog. the dog breaks loose, runs under the bridge and finds dolores. >> his last three victims are not initially connected by the police to btk. and that's because they're different. the bodies are in a different location. and he's not really attracted to one particular type of person. they're in the right place, the right location for him. then he acts. whether they're young, whether they'