>> would he kill again? that was the question consuming much of wichita, kansas, in the weeks after serial killer btk announced himself in 2004, following years of silence. >> i definitely lock my doors at night until i find out more. >> here in the heartland, fear of the unknown monster among them penetrated yet a new generation. >> my mom is going to watch out for my sister more. >> people were learning karate, buying guns, beefing up security systems and looking at strangers with a suspicion not felt in years. in his jailhouse interview, rader now claims he didn't know he was having this effect. >> i didn't realize the city really lived in fear that bad. i saw spurts of it on the news. people came home, looked under doors, under the beds and just really lived in fear. i didn't realize i had that potential. >> i dropped my jaw and i had a pad of paper and i made a note and i just scrawled, "liar."