Duane "Dog the Bounty Hunter" Chapman reportedly said that he had a "change of plans and couldn't bring himself to leave" Florida.
Gabby's death was determined to be caused by strangulation and is believed to have occurred between three or four weeks before she was found.
The coroner did not disclose any other findings from the autopsy, except that her body was believed to have been in the wilderness for three to four weeks before discovery.
Petito was first reported missing by her parents on September 11 and her remains were found near Wyoming's Grand Teton National Park on September 19.
"If he is alive, I think that they eventually will find him," a former FBI agent said.
The parents of the 23-year-old fugitive said they last saw him on September 13.
A former FBI agent said it was unlikely investigators would increase the charges against Brian Laundrie during a press conference on Tuesday.
The reality TV star has left the in-person search due to an ankle injury.
In the third week of the manhunt for Brian Laundrie, there is much speculation about where he might be hiding.
Survival experts tell Newsweek that Brian Laundrie would struggle in Florida's Carlton Reserve, even without the mental stress of being hunted by law enforcement.
Blue Ridge Parkway is an area of interest to investigators searching for Laundrie, who disappeared in the days after the death of his girlfriend Gabby Petito.
Duane Chapman has been accused of making racist comments, using homophobic language and carrying an illegal taser while filming in Virginia.
Dog, whose real name is Duane Chapman, has gone back to Colorado while his team remains on the search in Florida.
Lyssa Chapman has been giving updates on her and her father's search for Laundrie who has been missing for a month.
Chris Laundrie accompanied law enforcement officials to search Florida's Carlton Reserve.
Petito's father said he believes his daughter's fiancé is still alive.
One internet sleuth claimed to see "a hand reaching out" of the flower bed and said: "Stranger things have happened."
The search for Brian Laundrie has focussed on a Florida Reserve, but the lack of any breakthrough may suggest he has left the State, an expert has claimed.
The search for Gabby Petito's fiancé Brian Laundrie has been given a boost after an area of interest has reportedly become more accessible.
As part of the search, Duane Chapman has been studying Brian Laundrie's social media, and he found some of his posts disturbing.
"Hopefully Brian will be located soon," the Laundrie family attorney, Steven Bertolino, said in a statement on Thursday.
"The preserve has been closed to the public and the Laundries as well but the parents have been cooperating since the search began," the Laundrie family attorney, Steven Bertolino, said in a statement.
"Chris was asked to point out any favorite trails or spots that Brian may have used in the preserve," the family lawyer said.
Brian Laundrie's parents don't believe he left the area, but some are skeptical that he'll be found if he hasn't been already.
Brian Laundrie has managed to evade arrest for weeks, despite a massive manhunt
The fiancé of Gabby Petito was last seen on September 13, according to an updated statement from his family attorney.
Investigators have extended their search for Laundrie to North Carolina, after a hiker there said he believes he spoke with Laundrie over the weekend.
"To be completely honest with you, the FBI is never going to let Dog the Bounty Hunter catch Brian anyway—the FBI is way too prideful for that." Cecily Chapman said.