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Lori Vallow throws a pool party hours after her estranged husband was killed by her brother

Dateline uncovered more disturbing details about how Lori Vallow laughed and was nonchalant about her estranged husband being shot to death.

BOISE, Idaho — On July 11, 2019, Lori Vallow's brother Alex Cox called 911 to report that he had just killed Charles Vallow, JJ's father and Lori's estranged husband. During Friday's episode of Dateline, new unsettling details surfaced about how Lori Vallow acted after finding out about Charles' death.

"I got in a fight with my brother in law and I shot him in self-defense," Alex said in police bodycam footage. "He came at me with a bat."

Lori Vallow, JJ Vallow and Tylee Ryan, who both have been missing since September, were at their home when police arrived to question Cox about the death of Charles Vallow. Lori Vallow didn't appear rattled or upset about the death of her husband. 

In police bodycam video, she can be seen even laughing and apologizing to her neighbors about the police presence.

Arizona detectives told Dateline that throughout their interviews with Lori Vallow, she never seemed to be phased that her brother had shot and killed her husband.

"Lori was kind of like a happy go lucky, she was just kind of smiling, she was talking about how Tylee was going to go to BYU-Hawai and it was just a very, very nonchalant, you would have thought we just recovered their stolen vehicle," a detective said.

MORE: Friend of Chad Daybell blames Lori Vallow's extreme religious beliefs for the disappearance of her kids

Cox was also seen dabbing at a wound on the back of his head that he said he got when Charles Vallow hit him with a baseball bat.

"It definitely didn't appear that he was struck with an extreme amount of force with a baseball bat, Charles was a very physically fit man and actually a former college ballplayer, so it didn't appear that it was a huge strike to the head," the officer said.

Months later, Cox suddenly died from unknown causes. The cause of death is still under investigation.

RELATED: Audio from 911 calls linked to missing Rexburg kids case emerge

The same day that Charles Vallow was killed, neighbors said Lori threw a pool party.

Tylee's aunt, Annie Cushing, told Dateline that she believes that what Lori and Cox told was a cover-up and the children went missing because of what they knew.

"I do wonder with Tylee if she was asked to toe the line to keep everyone out of prison," she said.

The day after Charles' death, Lori texted Charles' two sons from a previous marriage that their father had died. Charles' ex-wifeCheryl, couldn't believe that that's how Lori broke the news to them.

"I couldn't believe that she did that, in that way, I mean I wish she would have called me and said can you please tell cole but to do it so brutal through a text was just horrible," she said.

MORE: Interactive timeline of events: Missing Idaho children JJ Vallow and Tylee Ryan

RELATED: Arizona school details new information about Lori Vallow and son JJ

MORE: Missing Rexburg kids: A look at Chad Daybell and Lori Vallow's religious beliefs

Watch more on the search for Lori Vallow's missing Idaho kids:

See all of the latest coverage of the missing Rexburg kids in our YouTube playlist:

RELATED: Grandparents seek guardianship of missing Rexburg boy

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