BRIAN Laundrie may have got a Greyhound bus "unnoticed" to escape his home in North Port, Florida, according to online sleuths.
Gabby Petito's fiance was reported missing by his parents on September 17 after telling cops they had not seen their son since September 13.
Since then, a number of theories as to his whereabouts have surfaced online, with some experts suggesting he may be on the Appalachian Trail.
Dog the Bounty Hunter joined the hunt over the weekend, pledging to catch Laundrie before the fugitive's birthday in November.
Dog, real name Duane Chapman, said a lot of the information he has received points to the Appalachian hiking route.
Dog said: “Well, the leads yes have said that. The reason is that he spent a couple of months there in the past and he’s an outdoorsman. He’s got t-shirts on his social media with the mountains, he’s got pictures.
“He’s been there before. He’s very young. He’s not an experienced criminal.
“He’ll do what he should do. He can’t stay shop and shoplift, and stay in cheap motels or rob people like a lot of people that I chase.
“This kid is an outdoorsman so I think he went to, again, where he’s comfortable to the outdoors.”
Police had been searching the 25,000 acre Carlton Reserve for Laundrie without success.
Read our Brian Laundrie live blog for the very latest news and updates...
Online, one Reddit user speculated: " I think he’s in a mid-size city somewhere in the east. Cleveland, Pittsburgh, Columbus, Buffalo, etc. He took a Greyhound up from Florida.
Another said: "Greyhound bus in the first week and he would have gone unnoticed."
The Sun has contacted Greyhound to for comment.
FBI LEADS THE SEARCH
Cops have been searching for Laundrie after Gabby's death during their cross-country road trip.
Brian's family told cops he had said he was going for a hike in a nature reserve in Sarasota, Florida.
Search efforts led by police are likely to be scaled back as FBI agents lead the probe, reports say.
Josh Taylor, of North Port Police Department, told Fox: “The FBI is now leading the search. I’m told, it will be scaled back and targeted based on intelligence.
“Hopefully water will lower in areas hard to currently access.”
The Carlton Reserve is a 25,000-acre park and is home to venomous rattlesnakes, alligators, coyotes, and bobcats.
Panthers and black bears have also been spotted prowling in the reserve.
It is around 15 miles from the Laundries' home in North Port.
ARREST WARRANT ISSUED
Footage uploaded on Twitter by North Port Police shows teams on swamp buggies navigating the treacherous marshes.
Dog joined the search to find Laundrie on Saturday as he encouraged Americans with information to call the bounty hunter at 833-TELLDOG.
He knocked on the door of Laundrie’s parents at their home in North Port but was met with silence.
The bail bondsman has previously suggested how he would track down Laundrie.
Laundrie is being hunted by the FBI after an arrest warrant was issued for the 23-year-old.
He is accused of swiping a Capital One debit card and running up a $1,000 balance from August 31 until September 1.
GABBY'S BODY FOUND
The arrest warrant came weeks after Laundrie returned to Florida alone without his fiancée Gabby.
Gabby was reported missing on September 11 by her parents and her remains were found in Wyoming just a week later.
Laundrie was named a person of interest in the case but has not spoken with the police as he refuses to cooperate.
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