Duane Chapman — famously known as Dog the Bounty Hunter — believes he's found the key to finding the late Gabby Petito's missing fiancé, Brian Laundrie.

Petito, whose death has been ruled by the coroner's preliminary findings as a homicide, went missing while on a road trip across the US with Laundrie.

Laundrie was named "a person of interest" in the case, after he returned home to Florida alone and refused to cooperate with law enforcement.

He is now the subject of a nationwide manhunt, after he was last seen on September 14 — and a federal court in Wyoming has issued a warrant for his arrest.

[[imagecaption|| Credit: WENN Rights Ltd / Alamy]]

Dog told Fox News that he received a tip that Laundrie and his parents camped together at Fort De Soto Park in Pinellas County in the early days of September.

He alleges that they took two journeys to the area, one on September 1-3, and the other on September 6-8.

However, he claims that on the second trip, only two people returned. "They were registered, went through the gate," he told the publication. "They’re on camera. They were here."

This comes after Dog and his wife, Francis Frane, alleged to have discovered a "fresh" campsite in the Floridian woods. The bounty hunter told local law enforcement about his find — and stressed that Laundrie's parents were linked to the site.

The 23-year-old's parents have denied any knowledge of their son's whereabouts in a statement read through their lawyer, Steven Bertolino, on Monday, September 27.

"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 that was issued after Brian had already been missing for several days is just wrong," the statement reads.

[[imagecaption|| Credit: Instagram/Gabspetito]]

On Saturday, September 25, Dog told Fox News that he intended to find Laundrie before his 24th birthday, which is fast approaching on November 18.

He said that many of the tips he received claimed that Laundrie was located along the Appalachian Trail.

"That is the most leads coming right now that say that," Dog said, detailing that he had received over 1,000 leads. "I would say within 48 hours we probably will have a location where we start the tracking at."

Featured image credit: JosephPetito/Twitter

Dog The Bounty Hunter believes he's found a campsite used by Brian Laundrie