Gabby Petito: Police declare 'crime scene' as FBI enters Brian Laundrie's Florida home: LIVE UPDATES

The attorney for Brian Laundrie canceled a press conference that was scheduled for Tuesday after speaking with the FBI, Fox News has learned. 

Laundrie, 23, is the boyfriend of Gabby Petito, the missing Florida woman whose body may have been discovered Sunday in Wyoming.

He has been named a person of interest in the case.

His family told police that they have not seen him since last Tuesday. The autopsy of the remains found in the investigation is set to be completed on Tuesday, which could confirm that the body belonged to Petito.

The search warrant issued for computers and hard drives found in Gabby Petito's and Brian Laundrie's van highlights and odd text Petito's family received.

"On August 27th, 2021 the subject's mother, Nichole Schmidt, received an 'odd text' from the subject. The text message read, 'Can you help Stan, I just keep getting his voicemails and missed calls," the document reads.

The document goes on to explain that referring to Stan, Petito's grandfather, by name was unusual behavior for Petito. The exchange led the mother to begin having concerns for Petito's well being.

Just hours after raiding the home of Brian Laundrie’s was raided by FBI agents, law enforcement officers paid a visit to the home of Laundrie's sister, Cassie Laundrie.

Laundrie opened the door and let officers into the home.

Fox Nation host Nancy Grace highlighted important questions regarding Gabby Petito's disappearance and Brian Laundrie's actions. On "America's Newsroom," she said the condition of the body discovered in Grand Teton National Park will help determine the cause of death. Grace also questioned how Laundrie was able to leave his house unnoticed despite the constant press coverage at his home, suggesting he may have left the home much earlier in September.

NANCY GRACE: With all of the press and citizens outside the home, how did Laundrie get out and nobody noticed? That place has been staked out 24/7. Did he really go to Carlton Reserve? Why do we believe that? Other than that's what the parents said. I don't understand how the car could have left with him in it. And then the parents bring it back, and nobody sees any of this happening? I'm also very concerned about the condition in which Gabby was found – her remains. Was she buried? Was she at the bottom of a ravine? Was she attacked by animals? Did she die from the elements? Because if Gabby was buried, then she was murdered. That's what I need to find out. …

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Police had left a note on the vehicle after it was abandoned by Brian Laundrie last week asking that the vehicle be removed from the area he left it, according to reporting from the New York Post.

Laundrie's family did not remove the car, hoping he would eventually return to it.

FIRST ON FOX: The 911 caller who reported a "domestic dispute" between Brian Laundrie and Gabby Petito in Moab, Utah, on Aug. 12 was heard telling a dispatcher that "the gentleman was slapping the girl" and hitting her, Fox News has confirmed Monday after exclusively obtaining the audio of the call.

"He was slapping her?" the dispatcher was heard asking.

"Yes, and then we stopped. They ran up and down the sidewalk. He proceeded to hit her, hopped in the car and they drove off," the caller added.

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North Port Police just dropped off what appears to be collapsed cardboard boxes at the front porch of the Laundrie home.

Chris and Roberta Laundrie -- who were removed earlier from their home in North Port by FBI agents -- are now back inside their property.

The couple previously were placed in an unmarked van outside of the home for at least an hour.

Dan Riemer, a professional investigator in South Florida, tells Fox News that the FBI may have put the couple in a van alone together "because there is no expectation of privacy in a law enforcement officer vehicle.

"So if they are talking to each other it is either being listened to and/or being recorded," he added.

The Teton County Coroner’s Office tells Fox News' Jeremy Copas that the autopsy on the body found Sunday that is believed to be Gabby Petito will be conducted tomorrow. The office is bringing in a forensic pathologist from Sheridan, Wyoming, about 360 miles east. 

Once the autopsy begins it should take one to two hours, but microscopic inspection can push this for several hours. 

Steven Bertolino, the attorney for Gabby Petito’s fiancé, Brian Laundrie, tells Fox News' Stephanie Pagones Monday that he has "no comment" regarding the current situation unfolding at the Laundrie home in North Port, Fla.

FBI agents in the last hour rolled up to the scene before removing Chris and Roberta Laundrie -- his parents -- from the property, placing them in an unmarked van. 

Brian Laundrie, their son, is a person of interest in the Gabby Petito investigation.

His current whereabouts remain unknown.

Brian Laundrie, their son, is a person of interest in the Gabby Petito investigation. On Sunday, authorities found a body in Wyoming that is believed to be Petito's.

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The FBI, in a tweet, says it "is executing a court-authorized search warrant today at the Laundrie residence in North Port, FL relevant to the Gabrielle 'Gabby' Petito investigation."

"No further details can be provided since this is an active and ongoing investigation," the FBI added.

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