The expert said Horner’s mother had to explain the impact of his actions to help him understand

Tanner Horner, a former FedEx driver charged with kidnapping and killing 7-year-old Athena Strand in 2022
Juan Figueroa/The Dallas Morning News via Getty

Fritz also testified about video and audio shown to jurors from the day of Athena’s abduction, saying Horner’s behavior did not initially reflect the kind of emotional dysregulation she often sees in people with autism, a diagnosis Horner has previously been reported to have.

“I think that he doesn’t demonstrate the emotional dysregulation that I typically see in individuals on the autism spectrum in the moments prior to and right at the time of the abduction,” Fritz said, according to NBC DFW. “In other words, his language was kind, cautious, easy, and not scary at first, and then became highly disrespectful and horrific towards Athena.”

MISSING CHILD: Athena Strand, 7, Paradise, Texas

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Athena Strand in FedEx truck with Tanner Horner
NBC DFW/YouTube

Fritz also testified that Horner told her he had backed into Athena and later strangled her, a version of events she said was similar to what he told investigators. She said he did not mention sexually assaulting the child, according to NBC DFW.

Horner pleaded guilty to capital murder and aggravated kidnapping on April 7, PEOPLE previously reported. Jurors are now deciding whether to sentence him to death or life in prison without parole.

Athena disappeared from her family’s Wise County driveway on Nov. 30, 2022, while Horner was delivering a package to the home, PEOPLE previously reported. Prosecutors say he abducted her and killed her inside his truck; jurors have since been shown video and audio from inside the vehicle capturing her abduction and what happened inside the truck.

Her body was later found in a rural creek two days after she vanished, and the medical examiner determined she died from blunt force trauma, smothering strangulation.