Josh Powell Home Explosion: How Could it Happen?

The unthinkable tragedy may shed light on Susan Powell's 2009 disappearance.
2:59 | 02/06/12

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Transcript for Josh Powell Home Explosion: How Could it Happen?
-- more now on that shocking tragedy in Washington State authority saying the husband of missing mom Susan Powell intentionally set fire to was house. Just after his boys arrived for his state supervised visit. ABC's Andrea canning is here now with more on how this could happen in the background of this tremendously. Very upsetting case together so much -- going on with these two families it was it was it was not it was not good -- relationship and that obviously contributed to what happened. Josh Powell's attorney says he was distraught when he was once again denied custody of the boys at a hearing late last week. This is a family tragedy -- gone from the mysterious to what some are now calling people. The fire that ripped through Josh Powell's home Sunday was a shocking and to a complicated story. That centered on Josh Powell in the disappearance of his wife Susan Cox Powell. For her family and even his own estranged sister and her husband it was their worst fears come true. Josh -- actions really showed his character. More than anything else we've seen for the last two years. I was afraid that if he had the chance. The only way he could win this game that he -- playing -- to kill -- Powell's final actions came in part sources say due to an ongoing bitter family feud Powell is coming here helping -- -- season. Which started more than two years ago when Susan went missing from their home in Utah and Josh moved to Washington to start a new life. In this interview with ABC's -- who drove Powell said he had nothing to do with his wife's disappearance. I would never hurt her. I would never hurt. -- boys have never hurt anyone. But when the home Josh shared with his father Stephen was raided by police Josh lost custody of seven year old Charles and five year old Braden to Susan's parents. In the raid Stephen Powell was charged with possession of child pornography and accused of secretly recording videos of women including Suzanne. Susan was very very sexual with me she was very flirtatious. I'm -- I'm her father in law. And I did I mean we we interacted -- a lot of sexual ways. Stephen Powell even wrote love songs about her with lyrics like -- best I can look you mean missing. You think a part of you started falling in love with Susan. Yeah I would say so and and and there's no question in my mind that the feelings were mutual and you knew about pets. She's a very flirtatious person. But Josh Powell was still the only person of interest in his wife's disappearance. Both her family -- his. Now worry that the mystery of her whereabouts may have died with him will never get those answers now and he could have at least left little behind -- Susan Powell's parents issued a statement through their attorneys Sunday telling ABC news they were always fearful that their son in law what harm has boys. They -- devastated by -- having already lost a daughter and now they're warning two grandsons its one of those questions you just have to ask why it's why tell the boys Andrea thanks so much.

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

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