Lois Gibson says there is one telltale feature Laundrie will struggle to hide or alter—and it could lead to his capture.
The reality TV personality, whose real name is Duane Chapman, said on Thursday that he felt "real good" about how the search was going.
Florida Sheriff Grady Judd said he would have detained Brian Laundrie once it became clear he had returned home without Gabby Petito.
An upset Gaby Petito is seen telling Utah police Brian Laundrie had hit her in the new clip.
Retired FBI agent John MacVeigh has said that the person of interest in the disappearance of Gabby Petito may have fled the country.
Social media posts about such a banner appeared after the reality TV star joined the search for Laundrie.
"You're going to jail...you just assaulted me on camera," the protester can be heard telling the neighbor in a video.
A Wednesday report revealed that show producers are pitching a new show about Dog's daily life as he joins the national search for Brian Laundrie.
The unnamed man said he was worried about being "attacked and accused" by members of the public.
Trump Jr. said that he has "much more faith in Dog The Bounty Hunter finding this scumbag than the FBI" on Wednesday night.
"[W]ith somebody who is such a high-profile person, such as a reality TV figure, injecting themselves is everything they learn now is public," said Dr. Bryanna Fox.
More details have emerged that add to a timeline of Laundrie's known appearances.
Two people provided new clues, which authorities directly attributed to the Petito coverage.
"The Laundries did not help us find Gabby. They're sure not going to help us find Brian," the Petito family's lawyer said.
Attorney Steven Bertolino said the Laundrie family went camping from September 6 to September 8, before leaving the park together.
Petito's dad said if other cases don't receive the same attention and effort as his daughter's, "that's a shame because it's not only Gabby that deserves that."
In February, Petito shared an image of her and Laundrie together at Fort De Soto Park, located about 75 miles away from the Laundries' home.
Police confirmed Wednesday there is no ongoing investigation at the Fort De Soto Reserve, where Brian Laundrie and his parents went camping in early September.
Officials in Utah have not confirmed whether the leave of absence is directly related to the investigation.
The lawyer representing Brian Laundrie's parents said that any claims that his clients assisted in their son's escape are "just wrong."
"The speculation by the public and some in the press that the parents assisted Brian in leaving the family home or in avoiding arrest on a warrant," the Laundrie family statement said.
The 911 dispatcher said, "We just have the female from that 10-20 call 911 in reference to the situation with the male" during an audio clip posted on Twitter.
The North Port Police Department has continued to search Florida's Carlton Reserve for Brian Laundrie.
"She was full of life, always smiling," said Desiree Keeffe, a friend of Petito's mother, Nicole.
The search for Laundrie escalated last week when the 23-year-old man was officially named as a person of interest in his fiancée's death.
The dispatch audio contradicts reports that officers may have been unaware of a prior witness report, or initially believed Petito was the aggressor.
"Gabby is the most amazing person I've ever met... I'm asking you guys to be inspired by the way she treated people, all people," Joseph Petito, her father, said.
KTVU's Frank Somerville reportedly wanted to add a tagline to a report noting the media often disproportionately covers tragedies involving white women.
Judge Jeanine Pirro said: "An arrest should have been considered and there was probable cause to make it."