the police had no real reason to link this to the same person. morton: btk studied a lot about police techniques. he knew that the police, basically, were looking for a common m.o., a method of operation. he would wear disguises, so if witnesses saw him, he would look different. he would speak with an accent if he talked to anybody so there would be misinformation out there because he didn't want to get caught. ♪ otis: later in 1974, towards the fall, two brothers and a friend of theirs claimed knowledge of the otero homicides. eagle reporters found out about it and wrote a story about it. otis: and then, one day, a wichita eagle reporter took a phone call at his desk. the caller advised him that there was a letter at the wichita public library and named a library book that the letter would be in, told the reporter, "if you go get that letter and read it, i think you'll enjoy it."