The Shape of a Killer - Encore
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[MUSIC] Personally, I could sort of relate to Kathy Blair and just thinking about what that would be like as a woman, to be home alone. That is the boogeyman story for every woman, right? This is awful. [MUSIC] And intruder is in your house. Yeah. Someone is stabbing you. [MUSIC] This is a case that sticks with you throughout your life. My name is Derek Israel. I was working in the homicide unit when this case occurred. My name is Kerry Scanlon and I was the lead investigator on the Kathy Blair murder. [MUSIC] Kathy was a larger than life. [MUSIC] She's my big sister. I have always thought everything Kathy did was amazing. How would you describe her from a student's perspective? She was so kind, just believed in me wholeheartedly. It still makes no sense. [MUSIC] Who kills a choir director? Who does that? She's a monster. [MUSIC] I get notified that there's been another murder. [MUSIC] The victims are an elderly couple. They were the best parents who could ever walk. [MUSIC] They were just sweet people like anybody's grandmother and grandfather. Right from the get go, it started sounding really familiar. [MUSIC] It's so violent and it's eerily similar to Kathy Blair's. [MUSIC] And when we saw the connection, we just continued to work the investigation together. [MUSIC] Carrie and I both kind of came to the conclusion that there was a serial killer working here in Austin. [MUSIC] I was out testing a thermal scope. I needed to get some video, some beer. Rob Leaf has this thermal imaging scope. It's a night vision rifle scope. So I saw the car pull up in park. I zoomed in with the scope and by the time I zoomed in someone had gotten out, walked over to the sidewalk. [MUSIC] That is just unbelievably chilly. The last thing they were expecting was high resolution thermal video. This video showed the murderer walking towards Kathy Blair's house.
Transcription truncated.
Three murders in Austin, Texas, and little evidence to go on. Did a man testing a thermal imaging camera inadvertently capture the image of one of the killers? "48 Hours" correspondent Maureen Maher investigates.