Police search for motive behind Uber driver's hours-long killing spree: Part 8

Investigators worked to uncover the reason why Jason Dalton shot at seemingly random strangers around Kalamazoo, killing six of them and severely injuring two.
5:03 | 02/23/19

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Transcript for Police search for motive behind Uber driver's hours-long killing spree: Part 8
?????? So, Jason Dalton, now, sitting in this squad car. Arrested after this shooting spree. And he's headed to the first of two police interrogations. I know you've been searched but just per protocol, we just had to search you again and all that, okay? They are trying to figure out why did this happen? What was the motive? You're Jason, correct? Yes. Okay. How does he react to you? He was very soft spoken, very average. How have you been treated? Ive been treated okay. Jason Dalton's demeanor was docile, I would say passive. What ke to do right now? I'm -- kind of just whatever you guys are going to do. The real key in getting people to talk to you is getting them to feel comfortable and to start with a very mundane sort of nice approach, get him talking. You seem like a pleasant person. Well, thank you, and I appreciate you're being nice to me, too. Its not our job to be rude. We're human just like you. We tried to then start with the beginning of his day. How much sleep have you had in the last 24 hours? I think I've been going for probably more than 24 hours, just -- Is that Normal? He was not aggressive at all. He just chose not to answer some of our questions. Do you know how many people you killed tonight?. I would like to just plead the fifth. Okay. He keeps pleading the fifth, I don't want to talk about it. I don't want to give you particulars. What would you like to talk about in here? I really don't want to talk about anything. But as time goes on, he becomes more comfortable. Reporter: Once he started to finally give investigators specifics of what happened that day, he starts talking about this pivotal moment he had with his first passenger of the day, Matt Mellen. Once he has Mr. Mellen in the car, he starts driving erratically. Mr. Mellen obviously is getting extremely upset. And I accelerated out the west main hill and it was like -- and I made this corner, and I hit a car. Each detail is important because it's another piece of the puzzle in this entire crime where you have multiple crime scenes. A turn, squeal, and then it's like -- come to a complete stop. And he jumped, bailed out of the car. And I'm like, "You got to your destination, sir." And I just took off as fast as I could go. He drove into an apartment complex and came across a black fe I reached in and I grabbed my Glock. It was pow, pow, pow, pow, pow, pow, and I believe that I dumped the whole magazine there. I know I killed her and I don't even -- Why do you assume that you killed her? Because how could you survive hots? And what's so bizarre about this interrogation is that it seems that Dalton is marveling at his own handiwork. There was absolutely no emotion, there was no fluctuation in his voice. The Glock jammed. During that? During that. And I cleared the jam, to finish. As he goes on, he reveals details that we did not know previously. Such as when he approached Mary Lou nye at the cracker barrel parking lot. I walk up to this lady and I ask her, I ask her if she could spare a dollar to make America great again. And at she didn't have the dollar to spend, and I shot her. Mm-hmm. I remember that I shot a small person in the head. When you say a small person, what do you mean? I think like a child. And his voice changed, his voice changed drastically. He said, I shot a little girl. He felt badly for the child and the family of the child, but he didn't express any remorse for anybody else. I'm not a killer and this is what I'm -- and I know that I have killed. Yeah, you understand that. You know that. That's the odd part, he said that he's not a killer, but he knows he's killed. Reporter: During the course of the interrogation, police spend a lot of time trying to determine why he chose these particular victims, but Dalton said it was all at random. What's the connection between all of these people? Is there any connection for you between any of these people? No. And we just kept asking him, why? What happened? What happened in your life to make you do this? And then finally, after a long pause, he had quite the response. If you guys only knew --

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

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