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Previous coverage: Brian Laundrie died from self-inflicted gunshot wound, autopsy shows
According to Steven Bertolino, the Laundrie family attorney, Brian Laundrie's manner of death was suicide. It's unclear if the gun belonged to Brian, or where he may have obtained it.
NORTH PORT, Fla. - Chris and Roberta Laundrie filed a petition in Sarasota County, Florida, on Wednesday to gain access to the estate of their son, Brian Laundrie, who died by suicide in a nature reserve about five miles from their North Port home, according to Fox News.
Brian Laundrie was a person of interest in the disappearance and homicide of his former fiancée, Gabby Petito, who was reported missing on September 11 while the couple was on a cross-country road trip. Her remains were found near Grand Teton National Park on Sept. 19.
Authorities found Brian's remains with the help of his parents in the Myakkahatchee Creek Environmental Park in Florida on Oct. 20, more than a month after he left their home. He died of a self-inflicted gunshot wound to the head.
The petition for summary administration that was filed in Sarasota County on Wednesday would allow Brian's parents to access his estate since he did not have a will, the family's attorney, Steven Bertolino, told Fox News Digital.
A local Florida estate attorney listed in court records for the petition, William Galarza, did not respond to a request for comment on Thursday. Bertolino said that he is also still representing the family.
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Previous coverage: Brian Laundrie's skeletal remains found in previously underwater area of preserve
The FBI Denver field office confirmed that dental records were used to match what North Port PD referred to as "bones" found at the Myakkahatchee Creek Environmental Park in North Port Wednesday. Items belonging to Laundrie were found near the skeletal remains, according to North Port PD.
BRIAN LAUNDRIE UPDATE: FAMILY SURRENDERED GUN TO LAW ENFORCEMENT ON SEPT. 17 – BUT ONE WAS MISSING
Neama Rahmani, a former prosecutor who is not associated with the case, explained that a petition for summary administration is necessary when assets are less than $75,000.
"The estate will consist of Brian’s assets and liabilities," Rahmani told Fox News Digital. "Any civil wrongful death lawsuit by Gabby’s parents would be filed against Brian’s estate."
Brian Laundrie's parents visited Carlton Reserve Wednesday when remains were discovered
Chris and Roberta Laundrie turned over all their firearms to the FBI when they reported their son missing in mid-September, but one was missing, a source familiar with the investigation told Fox News Digital.
Law enforcement spent weeks searching in the Carlton Reserve and the Myakkahatchee Creek Environmental Park, a swampy area just miles from the Laundries' home.
Laundrie's parents joined the search in mid-October and his remains were located along with some of his personal items on Oct. 20. A notebook that was found "may be salvageable," according to police.
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North Port police admit they confused Brian Laundrie with his mother
After Gabby Petito was reported missing, North Port police thought they had a close eye on Brian Laundrie, but now they have realized they had a case of mistaken identity as they were monitoring him – and they blame his family, at least in part.
BRIAN LAUNDRIE AUTOPSY UPDATE: CAUSE OF DEATH WAS SUICIDE, SAYS FORENSIC ANTHROPOLIGST
Petito and Laundrie originally departed North Port for a cross-country road trip in Petito's converted camper van in June.
They made it to Moab, Utah, by August, where they got into a domestic altercation. Moab police chalked the incident up to a "mental health break" and separated them for the night, despite how visibly shaken Petito appeared.
Petito, whose death was ruled a homicide by strangulation, stopped responding to her family's messages in late August and Laundrie returned home to North Port in her van without her on Sept. 1.
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In the aftermath of Petito's death, her family created the Gabby Petito Foundation to assist survivors of domestic abuse and help parents locate missing children.
Bertolino said last month that Brian's parents were grieving their son's death.
"Chris and Robert are still mourning the loss of their son and are hopeful that these findings bring closure to both families," Bertolino said.
Follow updates on this story on foxnews.com.
Fox News' Michael Ruiz contributed to this report.
Paul Best is a reporter for FOX Business and Fox News. Follow him on twitter at @KincaidBest.