Person of Interest in Pa. Doctor Killing

Dan Abrams discusses the man police believe killed Melissa Ketunuti.
1:23 | 01/24/13

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Transcript for Person of Interest in Pa. Doctor Killing
Let's get more from "gma" legal analyst dan abrams. Big development overnight. And kind of a surprise. No connection. That's the stunning thing. You talk about the details of this crime. Someone who was tied up, burned, strangled in her home. Those jaded crime reporters immediately assume it was someone she knew very well. When the first reports said the boyfriend is not considered a suspect, of course, in my head, I'm thinking, yeah, right. But the reality is, they were pretty quick to clear him as a possible suspect. That was pretty interesting. Then, you've got these additional developments. And it sure sounds like the authorities think they have their guy. And you have this surveillance tape. We're seeing this more and more, dan. The cameras are everywhere. That's right. This is just good police work. You go back. You try to figure out what pharmacies or gas stations or whatever it is are nearby. And say, is there anything here we can use? You then match it up to other tapes that are nearby. You match it up to other evidence. Sounds like the authorities were able to piece this together, using surveillance tape. But then actually finding the truck and saying, they believe there's evidence there. I think they're going further than a person of interest here. It sounds to me like they believe they got their guy. They have made the difference.

This transcript has been automatically generated and may not be 100% accurate.

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