April 30- Lately, the big city has come back to the former lead investigator on the BTK case. Bernie Drowatsky has been interviewed by NBC, Fox, People Magazine, and even America's Most Wanted. Drowatsky was the detective who retrieved the very first BTK letter from that book at the library. "No doubt from the wording and information in the letter that this was from BTK. We were hopeful that maybe this would give us a clue to find the man," Drowatsky said.

Drowatsky says one of the first places he'd look for an untold clue is Wichita State University, the location where BTK copied some of his letters. KAKE News has learned from a source close to the investigation that before he shot the only survivor of his attacks, BTK asked him, "Haven't I seen you at the University?" That person was Kevin Bright, the brother of victim Katherine Bright. Drowatzky confirmed that back then, Kevin Bright was hypnotized in a search for new clues.

Katherine Bright and another victim, Julie Otero, both worked on the same assembly line at Coleman. KAKE News has learned that 30 years ago, police took Kevin Bright to Coleman several times to sit outside the plant in case he recognized anyone coming out.

Another untold clue may lie where Julie Otero's husband Joseph worked as an instructor at Rose Hill Airport. "Just some of the information that kind of sticks in my mind, some of the knowledge BTK had," Drowatsky said.

Other untold clues may lie in the poems BTK included in his letters, not in the contents of the poems, but in where the poems come from. Another untold clue may lie in who had a subscription to "Games" Magazine. "This guy is not dumb. Maybe he does that for a pastime, crossword puzzles, word games."

But Drowatsky, who has read over his BTK notes for years, thinks if the case is ever solved it will be through DNA. "My personal opinion is he's normal, he has a job, goes about his business everyday, fits in everywhere. I don't think he's outstanding as a weird person or anything, and that's one of the reasons he's so hard to catch."