Brian Laundrie reportedly thought about turning himself in after he murdered his fiancée Gabby Petito.

Aside from turning himself in, a source close to the family told The Sun that Laundrie also contemplated fleeing the country or committing suicide before he disappeared into the swamp.

"I'm sure he was contemplating everything... I'm sure he told his parents would turn himself in and fight the case. But that whole day was awful," the source said, referring to September 13, when Laundrie told his parents that he was going for a hike in Carlton Reserve near his parents' home at North Port, Florida.

According to the source, the moment that prompted Laundrie to leave home was when he found out that his mom was apparently in danger of being arrested.

"The police were talking to Steven (Bertolino, the Laundries' lawyer), and all the media frenzy stuff started. Brian found out that they might arrest his mom. That's when he left," the insider told The Sun.

According to the source, Laundrie's parents did not help their son evade arrest. The insider noted that his father, Chris Laundrie, even tried to stop his son from leaving since he was upset.

"But Brian said he needed to get fresh air and clear his head, which wasn't unusual for him," the source said.

READ NEXT: Brian Laundrie Protests Prompt Florida to Advance Bill That Would Make Demonstrations Outside Homes Illegal

Gabby Petito's Family Sues Brian Laundrie's Parents

Gabby Petito's family filed a civil lawsuit against Brian Laundrie's parents on March 10. Petito's father, Joseph Petito, and mother, Nichole Schmidt, accused Chris and Roberta Laundrie of knowing their son murdered Petito.

They also alleged that the elder Laundries were trying to help their son leave the country, WFLA reported. According to the court documents, Petito's parents believed that their daughter died on August 27 at the hands of Laundrie, who allegedly told his parents about what happened "on or about" August 28.

The lawsuit noted that Christ and Roberta knew of the mental suffering and anguish that the Petito family was experiencing but still refused to respond to questions from Petito's family and law enforcement.

It added that the couple also refused to disclose their son's whereabouts. The lawsuit continued to say that Chris and Roberta acted with "malice or great indifference" to the rights of Petito's parents.

The lawsuit noted that Laundrie's parents exhibited "extreme and outrageous conduct," which goes "beyond all possible bounds of decency and is regarded as shocking, atrocious, and utterly intolerable in a civilized community."

Court records showed that the Petito family is seeking damages of at least $100,000 for the "pain and mental anguish" they experienced as a result of the "willfulness and maliciousness" of Laundrie's parents.

The case is reportedly set for a preliminary hearing on June 30 in Sarasota County, Florida, where the lawsuit was filed.

Meanwhile, the source also told The Sun that Gabby Petito's family was likely using the "frivolous lawsuit to torment" Laundrie's parents while "avoiding the public scrutiny of doing it."

"I know for a fact that they thought it would come out in a public record request from the media that Roberta did this. When the record request was denied, and the media wouldn't publish an allegation like that without proof, they filed," the insider said.

The source added that "the bottom line is the Petitos filed this lawsuit knowing that if his mom did do anything that she could be blaming herself and is living with the consequences."

Brian Laundrie and Gabby Petito's Death

Last January, the FBI revealed that Brian Laundrie confessed to killing Gabby Petito in a message left in his notebook. 

In its final report on the case, the FBI said a review of the notebook revealed written statements by Laundrie claiming responsibility for Petito's death.

The FBI noted that its investigation has concluded that Laundrie was the only person responsible for Petito's "tragic death."

Apart from the notebook, the FBI confirmed that they also found a "backpack" and a "revolver" upon further search of the area, where Laundrie's remains were found. 

Gabby Petito's body was found at the Spread Creek Dispersed Campground near Grand Teton National Park in Wyoming on September 19. A Teton County, Wyoming coroner said she was strangled to death by a "human being," and the manner of death was homicide.

On the other hand, Brian Laundrie's skeletal remains were discovered at the Myakkahatchee Creek Environmental Park in Florida on October 20. His autopsy report showed that he died of a gunshot wound to the head, and the manner of death was suicide.

READ MORE: Gabby Petito Killing Sparks Move to Change Yellowstone's Zone of Death: Full Details

This article is owned by Latin Post.

Written by: Joshua Summers

WATCH: Gabby Petito: Timeline of Fateful Cross-Country Trip - From Eyewitness News ABC7NY