Jessica Ridgeway's Alleged Killer Austin Reed Sigg

Marisa Randazzo discusses the suspect in the killing of a 10-year-old Colorado girl.
3:00 | 10/26/12

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Transcript for Jessica Ridgeway's Alleged Killer Austin Reed Sigg
For "good morning america," clayton sandell, abc news, colorado. Let's get to dr. Raundas. Sigg has confessed to the abduction of the 22-year-old and the killing of a 10-year-old. Is it unusual for a killer to have two seemingly different victims? No. This play represent a progression of attempts that this person was going through. When we first heard about the reggie wan murder, we think about a pedophile case. With the attempted abduction, what it looks like more is he was testing the waters. Testing what it feels like to abduct someone. Certainly, he was interested in mortuary sciences. This may be something he was testing out to see what I would be like to engage in this, as horrific as it is. And he had a fascination with forensicses and apparently wanted to become a mortician. Absolutely. What we see with some people who engage in these types of incomprehensible crimes is that they may be drawn to this by reading about these types of murders and topsies. And investigations. And may, in some way, find it thrilling. And that kind of reinforces it. And they try to go a little bit further and a little bit further. At the same time, he seems to have been keeping up a normal life. T's not unusual. We've seen this in some of the most storied murders of our time. People who live almost a double-life, where they have a normal family life. And then, they engage in horrific things. Periodically, every so often. It's not a need to do all the time. But they do it. They get whatever release, a reward for it. And then, they go back to their normal life. Okay, doctor. Thanks very much.

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

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