hatteberg: i asked him, i said, "so, how did you pick your victims?" 'she's next.'" singular: so then he would start the process of stalking. stalking would involve an individual, and he would settle in on her. ♪ hatteberg: and then he would stalk these people for a period of time. he wanted to know all the information that he could get publicly about them. singular: he would then name his project -- again, a very organized process for him. ♪ when he gets to nancy fox, it will be called "project fox hunt." btk: at first, she was spotted, and then i did a little homework. i dropped by once to check the mailbox to see what her name was, found out where she worked. i stopped by there once, at helzberg, kind of sized her up. the more i knew about a person, the more i felt comfortable with it, so i did that a couple times. and then i just selected a night. ♪ jordan: nancy fox is a 25-year-old single woman. she has her own place, lives alone, and really is in control of her life. she has a full-time job at an architectural company, a part-time job at night.

hatteberg: when he saw that story, he decided, "i'm back. i'm starting up again."o, a little while after the eagle had its story about the 30th anniversary of the otero deaths, a letter came into the newsroom, and the return address was bill thomas killman, the initial as in "btk." inside were three pretty blurry photos of somebody lying on a floor and a driver's license. otis: my partner, dana gouge, and i are sitting in the homicide unit, working on cases. a captain came up to the unit and was holding an envelope in his hand, and he said that a reporter from the eagle newspaper said, "this is a weird letter we got at the paper. it appears to have a photocopy of three polaroid pictures of some female laying on the ground inside of a house." i will never forget when dana gouge opened that letter. he looked at what he had in front of him, he slid it across the desk to me, and there were three polaroid photograph photocopies of vicki wegerle laying dead in her home. also, with those three polaroids, was a photocopy of her missing kansas driver's license and the initi