Dog the Bounty Hunter has said that he believes Brian Laundrie could be a 'serial killer' as a result of reading things that he describes as being from the 'dark side'.
The 68-year-old reality TV star has been helping search for Laundrie who is a 'person of interest' following the disappearance and subsequent death of fiancée Gabby Petito.
According to Dog - real name Duane Chapman - he and his team uncovered some chilling novels as they built a profile on the fugitive.
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Speaking about his interests, Dog told The Sun: "I'm thinking more and more about him being maybe a serial killer, not just a killer of Gabby. The books he read are unbelievable."
He went on to add: "A couple of the books that he's been reading are 10 times worse than Dungeon and Dragons. This kid, Brian, has taken those books, obviously to heart.
"And this is what happens when your kid is looking at those kinds of things."
He went on to add: "He just overnight just didn't become a killer. A killer is made, and he is built to be or she, a killer.
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"He built himself to be that by looking at that kind of, let's say the dark side stuff. There are pictures of demons all over it."
One of the books Dog could be referring to is Lullaby, which Laundrie spoke about on Instagram when he wrote: "Reading is different than any other consumption of media, it takes more effort than staring at a screen half alive, it allows you to use your brain rather than melt it, and there is no author more stimulation to me than @chuckpalahniuk."
The horror-satire novel which was written by Chuck Palahniuk tells the story of a journalist tasked with writing about a series of cases relating to sudden infant death syndrome (SIDS) - from which his own child had died.
He ends up figuring out a connection between the SIDS cases and his own experiences and semi-voluntarily becomes a serial killer that has the power to make people die over minor irritations.
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Laundrie has been missing since 14 September and now, his sister has called for him to 'come forward'.
Speaking to ABC, Cassie said: "I really wish he had come to me first that day with the van because I don't think we'd be here.
"I worry about him. I hope he's ok and then I'm angry and I don't know what to think.
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"I would tell my brother to just come forward and get us out of this horrible mess."
Featured Image Credit: Twitter/@DogBountyHunter