Gabby Petito: John Walsh's son Callahan talks 'mistakes' made in case

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John Walsh: The public will find missing Brian Laundrie

Former 'America's Most Wanted' host weighs in on the potential whereabouts of Brian Laundrie in the developing Gabby Petito case.

Callahan Walsh, the son of John Walsh and co-host of "In Pursuit with John Walsh," believes the late Gabby Petito was in a domestically abusive relationship with fiancé Brian Laundrie, who is still missing. 

Callahan, a child advocate for the National Center for Missing & Exploited Children (NCMEC), told Fox News that police should have handled things differently when they responded to two emergency calls about Gabby and Brian fighting. 

"When law enforcement showed up, they didn't have that information of the caller saying they had seen Brian assaulting Gabby," Walsh said. "Mistakes were absolutely made. Were those mistakes made intentionally? No. Law enforcement works off of — especially law enforcement officers out in the field — [they're] working on the information that they get. When the police show up, it's a scary situation. People are nervous." 

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Walsh said Gabby, 22, and Brian's tumultuous relationship was evident though. "There were multiple accounts from multiple different witnesses that there was some sort of abuse going on between them. Who the aggressor was – that line blurs sometimes in domestic disputes," he explained. 

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"However, I know Gabby's friends have come forward and had detailed times where Brian has been very jealous, aggressive and stole Gabby's ID so she couldn't go out with her friends and did other strange things as well," Walsh added. "The fact that this guy has this history of domestic abuse, that their relationship was really in an unstable place and then this ultimately happens … It's such a cautionary tale for anybody that's in a relationship like that."

Walsh is also convinced Brian, 23, is responsible for Gabby's death. Her body was found in a camping area within Grand Teton National Park, Wyo., on Sept. 19, and the coroner's initial report indicated Gabby's manner of death was a homicide. 

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"The fact that he's remained silent, he's gone on the run. He's done everything to show his guilt and nothing to prove his innocence," Walsh pointed out. "His parents aren't cooperating with law enforcement … it's painting a bad picture. I think everybody in the country right now can say — almost without a doubt — that they believe Brian is responsible for this."

John (R) and Callahan Walsh (L) are dedicating some of their show ‘In Pursuit with John Walsh’ to the homicide of Gabby Petito. 

Brian's parents told authorities they last law him Sept. 14. He was headed to the Carlton Reserve in Sarasota, Fla., with a backpack. 

"[Brian] shows up at his home without his fiancée. Why are his parents not asking him questions? And if they are asking him these questions, then why are they not relaying that [information] to law enforcement?" he wondered. "These are things that law enforcement is desperate to know, and Gabby's family is desperate to find out as well."

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Walsh suggests it might be a stretch to charge Brian's parents with "aiding and abetting" because, as of Wednesday, Laundrie is still considered just a "person of interest."

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Brian returned alone to Florida from he and Gabby's cross-country van trip on Sept. 1. On Sept. 11, the Petito family reported her missing after not hearing from her since late August. 

"There are no charges against him, so when he was at home, when his parents were helping him — which in my mind is without a doubt they were helping him — he was not a wanted fugitive. Therefore, they were not aiding and abetting a wanted fugitive. They were just helping their son. So we'll see what comes down the line," Walsh said.

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But he clarified, "What [Brian's parents] are doing is not right. They should be working with law enforcement, they should be telling them everything they know about what their son has been up to when they last saw him or what they spoke about."

"In Pursuit with John Walsh" airs Wednesdays at 10/9c on ID and streams on discovery+.