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>> it was all surreal, it still is. things like that don't happen to small town people. i was very scared, i was worried that i was going to be next. >> he was the friendly former about to make it big on reality tv. >> he loved being on tv. >> a success to celebrate after so much loss, his first wife killed in an awful of fire. >> i was devastated this is my sister she was just this sweet giving person. >> they called it a horrible accident, but here is the thing. accidents just seemed to keep happening, deadly ones. >> these things kept coming up, intuitions that something wasn't ri...

sister she was just this sweet giving person. >> they called it a horrible accident, but here is the thing. accidents just seemed to keep happening, deadly ones. >> these things kept coming up, intuitions that something wasn't right. >> wife number two had a growing suspicion. and she also had a plan. >> i had actually watched an episode of dateline and i had a revelation. >> a dangerous mission, was her own life at risk? >> this is a mystery that won't and, you couldn't write the story. hello and welcome to dateline. the death of a young mother in my house fire was almost too much f...

>> it wasn't calling, it was screaming. >> screaming your name. and yet you're able to get blown off of the porch, open your eyes, your sons uninjured, you're able to grab -- without a mark on him. take him out of the house. run around, miraculously save your two daughters and let your wife -- let your wife perish in this fire. >> i didn't -- let >> with no time to rip that ply booed board off that house? >> by that time the fire was all the way around, what am i going to do? >> carlson insisted his first wife's death was a tragic accident, that's the same thing he was seeing about levi's deat...

Carlson escape the fire with only a small burn. so now, after he listened to carl to talk about the fire, the window and the rescue of his children, he fired back. >> you're watching a boarded up a little room, and you hear her calling your name -- >> it wasn't calling, it was screaming. >> screaming your name. and yet you're able to get blown off of the porch, open your eyes, your sons uninjured, you're able to grab -- without a mark on him. take him out of the house. run around, miraculously save your two daughters and let your wife -- let your wife perish in this fire. >> i didn't -- let >>...

>> reporter: arnold had evidence that karlsen escaped the fire with only a small burn. so now after he listened to karl talk about the fire, the window and the rescue of his children, he fired back. >> your wife's in a boarded-up little room and you hear her calling your name. >> it wasn't calling. it was screaming. >> screaming your name and yet you're able to get blown off the porch, open your eyes, your son's uninjured, you're able to grab your son out where this explosion just took place without a mark on him, take him out of the house, run around, miraculously save your two daughters and ...