According to Billie Dunn and Adkins, Hailey was on her way to a friend’s house across the street from their home in the 1800 block of Chestnut Street when she went missing.

The pair failed polygraph tests when questioned about Hailey, according to an affidavit.

On two occasions, Adkins reportedly walked out of the polygraph examinations he volunteered for. He failed the first phase of his third exam and, during the second phase, indicated Hailey Dunn could be found in Scurry County but refused to complete the exam when more specific questions about her location were asked.

According to the affidavit, investigators used cell phone records to discover Adkins allegedly did not accurately portray his whereabouts the day of Hailey Dunn’s whereabouts. Investigators said he visited Colorado City the day she went missing at a time she likely would have been home alone.

Investigators also said they discovered hundreds of articles about mass murderers in Adkins’s and Billie Dunn’s bedroom. Billie took responsibility for printing them out.

Six months after Hailey’s disappearance, Billie Dunn moved to Austin.

Hailey Dunn’s disappearance garnered national attention, including discussion on Nancy Grace.