The boyfriend of slain cross-country traveller Gabby Petito admitted killing her in a notebook discovered near his body in a Florida swamp, the FBI says.

Brian Laundrie admitted in a journal to killing Gabby Petito during a cross-country trip, says the FBI.

Brian Laundrie, the sole suspect in the strangulation of his girlfriend Gabby Petito during their US road trip, took his own life, according to a lawyer for his family .

Deceased fugitive Brian Laundrie died of suicide, a forensic anthropologist told Laundrie family attorney Steven Bertolino on Tuesday.

Brian Laundrie died by suicide from a gunshot wound to the head, an attorney for the Laundrie family told CNN on Tuesday.

Ted Williams discussed the developments in the Brian Laundrie manhunt after authorities said unidentified human remains and the fugitive's possessions were found in Florida's Myakkahatchee Creek Environmental Park.

Partial human remains will be examined after being found during a search for the man the FBI are calling a "person of interest" in the murder of Gabby Petito.

Authorities looking for Brian Laundrie in connection with woman who vanished on road trip

Law enforcement have reportedly found what appears to be partial human remains in an area that was underwater, near where some belongings believed to belong to Brian Laundrie were found

Police in Florida are searching a 24,565-acre park for Brian Laundrie, the fiancé of missing YouTuber Gabby Petito.

A TikToker has gone viral over her claim to have picked up Brian Laundrie hitchhiking alone in Wyoming around the time his girlfriend, Gabby Petito, was last seen.

Reptilian agenda is Brian Laundrie eaten by alligators before he gets questioned...by detectives thats diverting course of justice #reptiles

Brian Laundrie's parents defend their silence throughout Gabby Petito's disappearance: 'It is what most people would and should do' https://t.co/4gFLsQT8L0 via @Yahoo

The parents of Brian #Laundrie argue their choice to remain silent during the disappearance of Gabby #Petito “is what most people would and should do” https://t.co/m8otpgJRLg

The lawsuit in connection to the Gabby Petito-Brian Laundrie case was initially filed in March. https://t.co/taefOKK0Q0

Most people hated Brian. Nazi followers almost 12? Some truth to Gabby. Petitio "that". Picking cherries so much more "Hell it was free and cheap" Brian. https://t.co/KGargUe5sy

NORTH PORT — The parents of Brian Laundrie have again asked a judge to dismiss a civil suit filed by the parents of Gabrielle “Gabby” Petito. https://t.co/phj8ypPoJa

NORTH PORT — The parents of Brian Laundrie have again asked a judge to dismiss a civil suit filed by the parents of Gabrielle “Gabby” Petito. https://t.co/pzmMavP7B7

NORTH PORT — The parents of Brian Laundrie have again asked a judge to dismiss a civil suit filed by the parents of Gabrielle “Gabby” Petito. https://t.co/hEoHbzlm8g

NORTH PORT — The parents of Brian Laundrie have again asked a judge to dismiss a civil suit filed by the parents of Gabrielle “Gabby” Petito. https://t.co/l7Lb3dwvFP

It's true. We've crossed the Rubicon, and we can no longer come back. Brian Laundrie's parents defend their silence throughout Gabby Petito's disappearance: 'It is what most people would and should do' https://t.co/hxVHURTnDZ via @YahooNews

Brian Laundrie's parents defend their silence throughout Gabby Petito's disappearance: 'It is what most people would and should do' https://t.co/OY6qe8DWKa via @Yahoo

RT @CrankyOtter: @FrankFigliuzzi1 @saffship The Nashville bomber was reported, badly investigated & ignored. The Thousand Oaks shooter had…

The lawsuit in connection to the Gabby Petito-Brian Laundrie case was initially filed in March. https://t.co/6NZsF8h7mW

Brian Laundrie really tarnished the Rugged Van Life Boy aesthetic for me.

RT @thedailybeast: Brian Laundrie’s parents have argued that remaining silent during the frantic search for their son’s fiancee Gabby Petit…

RT @thedailybeast: Brian Laundrie’s parents have argued that remaining silent during the frantic search for their son’s fiancee Gabby Petit…

Brian Laundrie's Parents Say Keeping Silent About Gabby Petito Murder Is 'What Most People Would And Should Do' https://t.co/qa7X4YXFcH

Brian Laundrie's Parents Say Keeping Silent About Gabby Petito Murder Is 'What Most People Would And Should Do' https://t.co/rSlRvSQAIy