Brian Laundrie has reportedly made two more confessions regarding Gabby Petito's death aside from the shocking revelation in his notebook.

A source told Daily Mail that Pat Reilly, a lawyer representing Petito's family, said the FBI relayed to him that Laundrie made a confession on a "digital device," and the other confession was written but was not in the notebook that was previously released.

Reilly noted that each confession was "somewhat different." The lawyer reportedly appeared on NewsNation last month, claiming that Steve Bertolino, the lawyer representing Laundrie's parents, was in possession of a letter from Roberta Laundrie to her son that reportedly reads "burn after you read this" on the envelope.  

Reilly noted that it was written within the time that Petito was murdered and Laundrie committed suicide. However, the letter was not dated.

The lawyer called the letter "odd" and "pretty interesting," but did not provide additional details, just that the letter referenced Petito.

Laura Richards, a criminal behavioral analyst and host of the "Crime Analyst" podcast, recently said in her show that the three different letters were "highly significant."

Richards added that the three letters must be compared, and "if they are different then that would indicate deception and that there was a strategy in place to deceive," Crime Online reported.

Richards told Daily Mail that the FBI handed that evidence over to Bertolino while Reilly was present.

READ NEXT: Gabby Petito's Mom, Nichole Schmidt, Files New Lawsuit Against Brian Laundrie's Estate in Florida 

Brian Laundrie's Notebook Reveals His Motive in Killing Gabby Petito

Brian Laundrie's confession in his notebook was publicized late last month, revealing that he killed Gabby Petito because he wanted to "take away" the pain felt by his fiancée.

In the notebook, Laundrie noted that he killed Petito after she "injured herself" when she fell into a creek in Wyoming during their road trip last summer.

Laundrie said Petito's feet and wrist hurt, and she "was freezing, shaking violently." He said Petito also continually made sounds of pain while carrying her.

While she gasped in pain, Laundrie noted that Petito begged for an end to her pain. He said he would shake Petito to wake her up as he thought she should not close her eyes if she had a concussion. 

Brian Laundrie noted that he did not know how serious Gabby Petito's injuries were, but "she was in extreme pain." He then said that he ended her life with good intentions.

"I ended her life. I thought it was merciful, that it is what she wanted, but I see now all the mistakes I made. I panicked. I was in shock," Laundrie noted.

Bertolino earlier said that as part of the return of property in FBI custody, he was given Laundrie's notebook and turned it over to his parents. 

The lawyer added that he was sharing the notebook's contents "as a matter of transparency."

Brian Laundrie's Notebook Discovered

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 said they also found a "backpack" and a "revolver" upon further search of the area where Laundrie's remains were found. 

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.

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.

READ MORE: Florida Judge Invokes Johnny Depp Verdict During Hearing of Gabby Petito's Family Lawsuit Against Brian Laundrie's Parents

This article is owned by Latin Post.

Written by: Joshua Summers

WATCH: How Did Gabby Petito Die? Brian Laundrie's Notebook Contains Killer Confession - From FOX 13 Tampa Bay