A massive search is continuing in Florida for Brian Laundrie, the boyfriend of Gabby Petito, the 22-year-old woman who went missing on a cross-country trip and who authorities confirmed as the body discovered in the Bridger-Teton National Forest in Wyoming.
The search for the 23-year-old Laundrie is centered around North Port, Florida, where investigators said Laundrie returned to his home on Sept. 1 without Petito but driving her 2012 Ford Transit.
Laundrie has been named by police as a "person of interest" in Petito's disappearance. Laundrie has refused to speak to the police and has not been seen since Tuesday, Sept. 14, according to law enforcement officials.
The search for Laundrie is the latest twist in the case that has grabbed national attention as he and Petito had been traveling across the country since June, documenting the trip on social media.
Petito's parents, who live in Long Island, New York, reported her missing on Sept. 11 after not hearing from her for two weeks.
Brian Laundrie left parents’ home to hike day earlier than parents originally told investigators Laundrie family attorney Steven Bertolino confirmed to ABC News Tuesday night that the family now believes Brian Laundrie left to hike the Carlton Reserve on Monday, Sept. 13. Previously, they had told investigators he left on Tuesday, Sept. 14.
“The Laundries were basing the date Brian left on their recollection of certain events. Upon further communication with the FBI and confirmation of the Mustang being at the Laundrie residence on Wednesday September 15, we now believe the day Brian left to hike in the preserve was Monday September 13,” Bertolino said.
For more than three weeks, local and federal authorities have been combing through a 25,000-acre nature reserve searching for Brian Laundrie, the fiancé of 22-year-old Gabby Petito.
On September 1, Laundrie returned in Petito's van to the couple's North Port, Florida, home from a cross-country road trip the couple embarked on earlier in the summer, police have said. Petito's remains were later found in Wyoming's Teton County.
Laundrie has not been accused of any wrongdoing in Petito's killing. Laundrie's parents told police he left home on September 13 -- a day earlier than they initially told investigators -- to hike in the nearby Carlton Reserve.
Dozens of officers from agencies including the FBI, the North Port Police Department, Florida Wildlife Commission, several sheriff's offices and K9 search and rescue teams have been searching the reserve since Laundrie's parents first talked to police on September 17.
"The Carlton Reserve is a vast and unforgiving location at times. It is currently (waist) deep in water in many areas," North Port police said in a Facebook post last month. "This is dangerous work for the search crews as they are wading through gator and snake infested swamps and flooded hiking and biking trails."
CNN asked survival experts if it's possible Laundrie is alive if he has been in the reserve since mid-September. Here's what they said.
It depends on his supplies and experience In an ABC interview that aired last week, Laundrie's sister, Cassie Laundrie, said he had previously taken trips for up to five days on the Appalachian Trail. She said her brother is a "mediocre survivalist."
Robert Urban, founder and chief instructor of the Urban Survival Academy, said he believes it's highly unlikely that someone who is not professionally trained in survival tactics would be able to survive in the reserve for this long.
"Florida's climate is very, very difficult," Urban told CNN. "I'm an expert with plenty of experience, and it would be everything that I could do to survive for (more) than three weeks. Someone with no experience, you cannot be lucky and survive in that sort of climate."
Dog the Bounty Hunter is off Brian Laundrie's trail for now, but he says he plans to continue leading efforts to capture the suspect remotely.
Dog the Bounty Hunter, whose real name is Duane Chapman, is going back to Colorado to receive treatment for an ankle injury he experienced during his search for Laundrie, his team said Sunday. While he is away, Dog's "Florida Team" will continue the search while he processes leads in Colorado, according to WFLA reporter Josh Benson.
"DOG. Just got an update from Dog the Bounty Hunter’s team," Benson posted on social media. "They say he’s headed back to Colorado soon to meet with his doctor after injuring his ankle in the search. He’s also raising funds to continue what he calls an ‘expensive search’."
Dog's daughter, Lyssa Chapman, confirmed the news through her Twitter account Sunday, assuring both the family and their team in Florida are still looking for Brian Laundrie.
Dog the Bounty Hunter joined the hunt for Brian Laundrie on Sept. 27 — four days after a warrant was issued for Laundrie's arrest. Laundrie went missing shortly after he returned home from a vacation with his girlfriend, Gabby Petito, who was found dead in Wyoming on Sept. 19.
Authorities still have not found Laundrie — now nearly a month after his arrest warrant was issued. Laundrie's older sister, Cassie, said she does not know where her brother is, but if she did, she would cooperate with authorities.
She also said if she could talk to her brother, she would tell him to "just come forward and get us out of this horrible mess."