Photos believed to be the last taken of Gabby Petito and her fiancé Brian Laundrie -- the lone person of interest linked to her death -- together surfaced on Thursday (October 21), one day after human remains were found near items that belonged to Laundrie at a Florida campsite.

TMZ reports "the never-before-seen photos" were taken on August 10 when the couple was touring the Delicate Arch in Arches National Park during their crosscountry trip.

Petito shared several photos tagged from the same site on her Instagram account prior to her death.

On Wednesday (October 20), the FBI confirmed the discovery of human remains, as well as items -- including a backpage and notebook -- belonging to Laundrie in the Carlton Reserve campsite in Venice, Florida on Wednesday, where Laundrie's parents had previously claimed their son was last seen hiking in after he returned to Florida from a cross country trip without Petito.

Steven Bertolino, the attorney for the Laundrie family, said the said "the probability is strong" that the remains are Brian's and confirmed the 23-year-old's parents have been part of the team searching for him during an appearance on CNN.

"It's quite sad, you can imagine as a parent, finding your son's belonging alongside from the remains. That's got to be heartbreaking. And I can tell you that they are heartbroken," Bertolino told Chris Cuomo.

On October 12, Teton County Coroner Dr. Brent Blue -- who performed an autopsy on Petito -- announced her death was ruled as a death by strangulation and the manner of death to be a homicide during a press conference on Tuesday (October 12).

Dr. Blue said Petito's death is believed to have occurred 3-4 weeks prior to her remains being found on September 19 and confirmed to match her days later.

Dr. Blue confirmed the ruling was made while working alongside local and federal authorities. No other information will be released in adherence with state law.

Laundrie has been the center of a publicized search by the Federal Bureau of Investigation and local authorities at the Carlton Reserve for the past month.

Dr. Blue said local law enforcement would decide who would be charged in connection to Petito's homicide case.

On October 7, Chris Laundrie joined authorities in their search of Carlton Reserve for his son, according to family attorney Steven Bertolino.

Remnants of a campsite that appeared to have been recently used were reportedly the focus of the search, a source close to the Laundrie family told CNN's Chris Cuomo last Wednesday (October 6).

On September 30, police released additional bodycam footage which shows Petito telling an officer that an argument with Laundrie got physical.

The newer footage stems from the incident on August 12 in Moab, Utah in which police made contact with Petito and Laundrie after a bystander called the Moab Police Department and reported seeing a man hitting a woman.