Transcript for Jason Dalton pleads guilty to Kalamazoo killing spree: Part 11
Now get $300 off the latest iPhone. As the trial date drew nearer, there was anxiousness. What's going to happen? Jury selection begins tomorrow in the murder trial of Jason Dalton. Reporter: This trial is about to start. And then suddenly, what everybody had been expecting that Jason Dalton is going to somehow try to plead insanity, goes away. I think he was influenced these last few days by his family. Jason Dalton had a phone call with his mother where he told her it was going to end. It's over. I stopped it. I was surprised and a little bit shocked because I was getting all of our material ready to go to trial and I got a text from the prosecutor's office. You are doing this voluntarily of your own free will? Yes, I've wanted this for quite a while. How do you plead? Guilty. We did not expect a guilty plea from Jason Dalton that day, but he pled guilty. Psychological professionals had examined Mr. Dalton and did not find that he met the legal standards. Reporter: Interesting. So, Jason still think that he had been controlled by the devil Uber app. However, his attorney said, that's not gonna hold up in court 'cause nobody believes you. That's certainly possible. You, Jason Brian Dalton, you're sentenced to a period of life in prison without the possibility of parole. I've reported on lots of horrible things, but this is one and the sequence of events, and these families, and these victims, it'll stay with me I have lost the woman I married for 41 years, and I lost my little sister. You are nothing but a pile of worthless evil. Worthless. Why? Just why? Were you mad? What kind of a person walks up to a father and a son and shoots them over, and over, and over again until they don't move? I've tried to hate you. I've tried to hate you. I pause, replay, and relive every single moment. You tried to kill us all, you failed. I'm standing here, right here in your face, in front of you. How does it make you feel? Look at me. How does it make you feel? Just look at me. Look at me, please. Why? That is only going to be known to you and to our creator. Where are the answers? We know there are victims, we know an Uber app is blamed. But it is frustrating. Why did this happen? May never know. Reporter: What we do know is that Dalton says it all started with an Uber app. Uber tells ABC safety is a priority. Now, when you're taking an Uber, you can reach 911 directly through the app. Uber tells us that it now has what it calls a critical safety response line. It's a phone number that allows a user to directly reach Uber in case of an emergency. But it only launched this feature two years after the shooting. Could it be easier if there were a reason? It would make me feel better. I don't understand why it was me. Why it had to be me and why it andma barb. We both didn't deserve it. She always wanted to go on a hot air balloon ride. So I took her ashes to sedona and went in a hot air balloon. And left her out there in the desert. So she's right where she wanted to be. We always believed that she was going to outlive me. We made discussions what to do when I died. But we never really contemplated what I would do. I want to go grocery shopping, 'cause I end up picking up things, forgetting that they're not here. And so, it's just painful. We don't want them to be remembered by, oh, that's the people that got killed by the Uber driver. I want them to remember, oh, those are the two, loving, caring, compassionate people that were taken way too soon. Him gunning me down, it doesn't define me. Tiana now? I'm strong. Stronger than I ever could imagine. They say Kalamazoo strong, this is a community, you can knock us down, but we're gonna get right back up.
This transcript has been automatically generated and may not be 100% accurate.