The FBI on Sept. 19 discovered Petito's remains at a dispersed campground in the Bridger-Teton National Forest. Blue later identified the remains and ruled Petito's death a homicide in his preliminary autopsy report.
The press conference will be held at 12:30 p.m. MT and is limited to members of the press, according to a Teton County spokesperson.
The final autopsy report will likely include Petito's time and cause of death, which may help investigators determine who killed her, though that information may not be released publicly.
Salt Lake City-based private investigator Jason Jensen, who visited the scene where Petito's remains were discovered over the weekend, told Fox News Digital that he believes Blue will also discuss the results of a postmortem toxicology test, which detects drugs in a person's system. Jensen added, however, that he also believes Petito was not using drugs at the time of her death.
Petito's parents reported her missing eight days before her remains were discovered. The 22-year-old was traveling cross-country in a Ford transit van with her fiancé, Brian Laundrie, when she went missing.
Laundrie, 23, returned home to North Port, Florida, on Sept. 1 in the van without Petito, and her parents filed a missing person report on Sept. 11. Laundrie is a person of interest in the case, and his whereabouts have been unknown for weeks. His parents reported him missing to North Port, Florida, police on Sept. 17.
On Sept. 23, the FBI issued an arrest warrant for Laundrie, accusing him of bank card fraud. Authorities alleged at the time that he used an unidentified person’s Capital One card and the personal identification number to charge or withdraw over $1,000 between Aug. 30 and Sept. 1, during which time Petito was still missing.
Jensen also said he thinks the cause of death may be asphyxiation and referenced Petito's body language in an Aug. 12 bodycam footage from Moab, Utah, police in which she describes how Laundrie grabbed her face during a domestic dispute.
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"I wouldn’t be surprised that it’s manual strangulation. I wouldn’t be surprised if he’s choked her before," Jensen said. "Any victim that’s been choked before — their natural reaction is to lower their chin to their clavicle to prevent that hand from going around their throat."
Fox News' Stephanie Pagones contributed to this report.