Updated at 12:20 p.m. Thursday to reflect that Kavanaugh's attorney declined to comment.

A sexually explicit Facebook conversation that Lauren Kavanaugh had with a 14-year-old girl led police to arrest the "Girl in the Closet," a victim of childhood sexual abuse herself.

Lauren Ashley Kavanaugh (Denton County Sheriff's Department)

Kavanaugh, 25, confessed to having sex with the teen and told a Lewisville police detective to "arrest me!" last month when she was taken into custody on a charge of sexual assault of a child, reveals an arrest warrant affidavit obtained this week.

The affidavit, filed in Lewisville municipal court and recently unsealed by a judge, details sex acts the two engaged in while Kavanaugh was living with the teen's family at a Lewisville motel from Nov. 1 to Dec. 17, when she was arrested.

Kavanaugh's attorney declined to comment Thursday.

As a child, Kavanaugh was the victim of horrific abuse at the hands of her mother and stepfather, who locked her in a filthy closet in their Hutchins trailer. The Dallas Morning News told her story in an eight-part series titled "The Girl in the Closet."

Her mother and stepfather, Barbara and Kenneth Atkinson, are serving life sentences in Texas prisons. They are eligible for parole in 2031.

Last month, Facebook contacted the National Center for Missing and Exploited Children after monitoring software detected a suspicious interaction between an adult and child. The center reported the possible crime to Lewisville police.

In one of the Facebook Messenger conversations, the girl tells Kavanaugh that she has a teacher the same age as Kavanaugh, according to the affidavit.

Kavanaugh responds: "My friends are teachers, and they are my age."

Lewisville police Detective Bryan Gibbins wrote in the arrest warrant affidavit that he contacted the teen's mother Dec. 17 about the online conversations and asked her to bring her daughter to the Denton County Children's Advocacy Center for an interview.

The girl told a forensic interviewer the same day at the advocacy center that she had met Kavanaugh through a Facebook fan page called "The Lauren Kavanaugh Story," Gibbins wrote.

The affidavit does not say when Kavanaugh and the girl first communicated, but the fan page has since been disabled.

After chatting on Facebook, Kavanaugh and the girl began texting each other, Gibbins wrote. They stopped communicating in October 2017 when Kavanaugh moved away.

But last year, Kavanaugh returned, reconnected and moved in with the girl's family.

"Lauren returned to Texas in the summer of this year and [the girl] reached out again," the police detective wrote. "Lauren moved in with [the girl] and her family."

The girl also detailed sex acts between her and Kavanaugh, including the night before Kavanaugh's Dec. 17 arrest, according to the affidavit.

Gibbins wrote that he went to an extended-stay motel in Lewisville, told Kavanaugh that he was a police officer and asked if she would come to the department to talk with him. She agreed.

"I explained that she wasn't under arrest and that I just had a few questions for her," Gibbins wrote. "Lauren said that was fine."

When she and Gibbins arrived at the Lewisville Police Department, Kavanaugh again agreed to talk with him, he said. During the interview, she confirmed that she had been living with the teen's family since early November and that she and the girl were "just friends," the affidavit says.

Then, Gibbins told her that he had a transcript of their sexually explicit chat.

"I asked Lauren if that was true and after sitting quietly for a while, Lauren looked up at me and said 'yes,'" he wrote. "Lauren also said that was the only time and that she was sorry and learned her lesson."

He then asked Kavanaugh whether there were other times she and the girl were "involved sexually," and she became upset.

"If you're going to arrest me, arrest me!" she responded, according to the affidavit. Kavanaugh then said she didn't want to talk anymore.

She was booked into the Lewisville jail on a charge of sexual assault of a child, a second-degree felony, punishable by up to 20 years in prison. She remains in jail in lieu of $10,000 bail.