was last seen alive on August 27 in Jackson Hole, trying to defuse a heated argument between fiance Brian Laundrie and a hostess at a Tex-Mex restaurant, according to a witness - shifting the timeline of when the 22-year-old ‘van lifer' was spotted.
Investigators were initially operating under the assumption that Petito, whose body was found at Grand Teton National Park in Wyoming on Sunday, was last seen alive on August 24 leaving a Salt Lake City hotel with Laundrie.
However, Nina Celie Angelo of New Orleans said she and her boyfriend were at the Merry Piglets restaurant in Jackson Hole on August 27 and saw the tragic Long Island woman try to calm down the hot-headed Laundrie, during an interview on Thursday with ABC's Good Morning America.
'He was just very visibly angry.
She was really upset. She was crying. He immediately went to the hostess stand and was going in on the hostess and the waitress and eventually the manager,' Angelo told GMA.
'It was almost like he was screaming. She was like "I'm sorry, come on just let's just go." But she was physically upset, she was crying.
You could feel his temper. He was angry.'
The sighting at the Jackson Hole restaurant places Petito 300 miles north of Salt Lake City and just 45 miles from the Wyoming campground in the Grand Tetons where her remains were found.
Nina Celie Angelo (left) of New Orleans says she saw Gabby Petito and Brian Laundrie (right) on August 27 at a restaurant in Jackson Hole, Wyoming.
Her account has been confirmed by the restaurant. Petito was reported missing on September 11 after she and her 23-year-old fiancé, Laundrie, set out from New York on a cross-country road trip in her white van two months earlier. They were documenting their travels on social media platforms including Instagram and YouTube
Angelo, a photographer, was with her boyfriend, financial adviser Matthew England, when they stopped to have lunch at Merry Piglets sometime between 1 and 2pm.
The couple was in Wyoming in late August to attend a wedding. While dining at the restaurant, they overheard a loud conversation in which another customer, Laundrie, was heard screaming at wait staff in what appeared to be an argument over the check
Angelo's account means that Petito was last seen alive on August 27.
It was previously assumed that she was last spotted alive in Salt Lake City three days earlier
Petito was reported missing on September 11 after she and her 23-year-old fiancé set out from New York on a cross-country road trip in her white van two months earlier.
They were documenting their travels on social media platforms, including Instagram and YouTube.
Angelo and her boyfriend, Matthew England, were traveling through Wyoming in late August to attend a friend's wedding.
England provided a credit card statement to which indicates that he spent $60.88 at the Tex-Mex joint on August 27.
According to Angelo, she and England stopped to have lunch at Merry Piglets sometime between 1 and 2pm.
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A restaurant employee told DailyMail.com on Wednesday: 'We have already talked to the authorities about the situation and we are not allowed to comment on it further.'
Merry Piglets officials later posted on Instagram: 'Yes, we can confirm Gabby and Brian were in Merry Piglets.
'We have already notified the FBI and they are aware.
We are letting them do their jobs and we are respecting Gabby's family and have nothing further to comment.'
Angelo, a photographer, was with her boyfriend, financial adviser Matthew England, when they traveled to Wyoming for a wedding in late August
Angelo says England recognized Laundrie and Petito after seeing news reports that included police body cam footage of the couple during an August 12 incident in Moab, Utah (above)
The FBI would comment on the validity of Angelo's claim.
But Angelo insists she and Matthew overheard a loud conversation in which another customer nearby, Laundrie, was heard screaming at waitstaff in what appeared to be an argument over the check.
Angelo said that the man involved in the dispute displayed ‘aggressive' body language.
Laundrie left the restaurant and then returned around four times, she said.
Afterward, Petito came into the restaurant and apologized to waitstaff for his behavior.
Angelo said she completely forgot about the incident when the couple returned to New Orleans to find the region ravaged by Hurricane Ida.
But coverage of Petito's disappearance aired daily on TV and service lawn mower engine [Www.insiderpages.com] the couple caught a story about police body cam footage showing Petito and Laundrie being interviewed by an officer after a domestic incident in Moab, Utah.
Jenn Bethune, who runs 'Red, White and Bethune' on YouTube, said she found footage of Petito's van when she parsed over her videos from Grand Teton National Park after she was tagged in a post urging anyone who had filmed or photographed the area to search for clues.
This image was taken hours after the restaurant incident on August 27
Jenn Bethune (pictured left), who travels the country with her husband Kyle (pictured right) and her three children in a 1983 Silver Eagle bus that they call 'Blue Betty' (also pictured) said she remembered driving past the van because of its Florida plates - she and her travel partner, she said, are originally from the state.
As England watched the images of Petito and Laundrie in the body cam footage, it began to dawn on him early on Wednesday morning that they looked familiar.
'He goes, "Nina, that was the couple fighting at the restaurant",' Angelo said.
<div class="art-ins mol-factbox news halfRHS" data-version="2" id="mol-0e48ffb0-1c71-11ec-b76c-1d2ca0e5600b" website Laundrie incident was days after last sighting of Gabby Petito