daniel lee corwin.seen a lot of composites in 40 years of police work, and never seen one that good. that looks just like him. narrator: in the mid-1970s, when corwin was in high school, he was found guilty of assaulting and attempting to murder a fellow student. her name was brenda evans, and like wendy gauntt, she also survived by playing dead. when she's in the ambulance, she can barely speak 'cause her throat's been cut, and she said, "daniel corwin did this." narrator: the attack on brenda was virtually identical to the attack on wendy, on mary risinger, and the other two cases in which the victims did not survive. in all those cases, the killer used a knife, which was not left at any of the crime scenes. police in huntsville, texas, were confronting something they'd never seen before. when this case dropped, serial killer wasn't something that came to my mind. burrough: the idea that there was a serial killer in some small texas town, as one of the police said to me, you know, "you might as well t

daniel lee corwin was execut by lethainjection. he was 40 years old. i didn't want something like daniel corwin to hurt either of my kids or any other kids like tha narrator: investigators are convinced that the sketch created by wendy gauntt and karen taylor, the one that finally alerted detectives to daniel corwin, saved an untold number of lives. ♪ hidalgo: daniel corwin picked the wrong woman to attack that day. he still would have kept killing. there's no doubt in my mind that that would have -- there would've been more people out there dead. taylor: wendy put a face on him. there was a lot of investigative work done on all these cases, but make no mistake, it was wendy who brought down daniel lee corwin. she connected the dots. it was her strength that put it all together. burrough: not a lot of people like that. she actually said to me, "i've had a great life, and the way i look on this is, i've had a great life for 38 years and one bad day." ♪ ♪ narrator: up next -- a late-night walk in an upscale neighborhood results in murder. the victim suff