Josh Powell murders young sons, kills himself in home explosion: Part 9

During what should've been a supervised family visit, Josh locks the social worker out of the house and then incapacitates his sons before causing an explosion. Susan Powell's family is horrified.
7:00 | 11/14/20

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Transcript for Josh Powell murders young sons, kills himself in home explosion: Part 9
This is a story you can't write in a Hollywood script. No one would've thought in a million years that's how this story would've ended. You talk about a tragedy, this is it. The morning of Sunday, February 5th. Elizabeth griffin hall arrived at the rental house and parked out front. And as children do, Charlie and Braden got out of their car seats. They rushed to the front door, which is what they always did. I was one or two steps in back of them, and the kids just rushed in. I saw Josh for just one second. His eyes caught mine, and he H a look in his eyes. She looks him straight in the face, slams the door in her face, and locks it. I knocked and I knocked and I rang the doorbell, and I started yelling out, "Josh, let me in." And I heard him say, "Charlie, I've got a big surprise for you." And immediately she smelled gasoline and she knew it was an emergency situation. I'm on a supervised visitation for a court-ordered visit, and something really weird has happened. I think I need help right away. He looked right at me and closed the door. All right. We'll have somebody look for you there. Okay. How long will it be? I don't know, ma'am. They have to respond to emergency, life-threatening situations first. The first availablty -- Well, this is -- this could be life-threatening. He went to court on Wednesday and he -- he didn't get his kidsck and this is really -- I'm afraid for their lives. Okay. Has he threatened the lives of the children previously? I have no idea. All right. We'll have the first available deputy contact you. February 5th, 2012. Super bowl Sunday. I went to church, I came home. Super bowl Sunday. I remember watching the super bowl that day and seeing the reports come in. Good afternoon, everyone. I'm John deselop, we are interrupting your programing for some breaking news. And I got a call from my neighbor. And he said, "Change the channel." I was actually in Indianapolis. The patriots were playing the giants at the super bowl, and I was there with my family. And it was half-time and Madonna was about to take center stage. As Madonna takes the stage to perform "Vogue," Abby's in the stadium concourse trying to absorb the text she just received. I get a text, it P on my phone. There has been a fatal explosion at the home of Josh Powell. I couldn't believe it. I couldn't believe it. I thought, I'm going to get help from the neighbors. They'll be able to help me get the boys out. So I went screaming to the I said, "There's two children in there. There's two children in there." I said, "Oh, my god." And I thought, like, natural gas or something. And they said, "They found three bodies." There's a fire. The house exploded, and we're hearing that Josh and Charlie and Braden are inside. This can't be. This can't be. I thought, "No, that can't be real. I would have heard something." I called Susan's father. I said, "Chuck, is it true?" "Chuck, chuck, is it true? Is it true?" And he said, "Yes, and I didn't even say good-bye." I just hung up the phone and started crying. I was looking at a -- a house with steam still coming out of it, and fires. And the sergeant or whatever said, "Yeah, they're there and they're dead." Honestly, I wasn't surprised. And the actions that he made after she went missing, I never underestimated him. And then, to find out the details, it just breaks your heart. The pierce county medical examiner said both boys had chopping wounds on their heads and necks, but that is not what killed them. The cause of death for all three was carbon monoxide poisoning. We believe he bought two five gallons worth of gas. And one was used in the room where the boys were killed. And then after he had incapacitated them here, arrange them on the floor next to each other and poured gasoline on and around them and around the and then he sa gas can and lit a match. They were still alive when the fire started, and they died of smoke inhalation. And there was also gasoline in their lungs. Police say there is clear evidence that Josh planned out this house explosion and meant to kill himself and his children. The morning of the 5th, he sent a couple of text messages and voicemails to essentially saying good-bye. His sister Alina found one when it was too late to intervene. After the explosion. What did he say? I think he said, "Hello, this is Josh. I am not able to live without my sons and I am not able to go on anymore. I'm sorry to everyone I've hurt. Good-bye. When yod the audio recording, what did you think? What did you make of that? I thought he had lost all hope. To find out that, you know, he used the ax first, and to find out that he said to them, you know, "I have a surprise for you." Any little bit of doubt that anyone could've possibly had that Josh killed Susan had to have gone out the window. The fact that he could've done that to his kids. This was a tragedy. This was deeply wrong. This was evil. You do not kill little kids. Police are convinced the explosion and the fire that destroyed Josh Powell's home was a murder/suicide. I don't know anything else I could have done and it -- they're still dead. My daughter's still missing, and now the children are dead. I had them safe. They were in my care. They were gone. I was frustrated with the child protective service agency. Why would they put this single woman in charge of these boys, and send her into the lion's den? They had the right to grow up. The cox family is determined to hold the state accountable and make them pay for the deaths of their grandchildren.

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

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