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BRIAN Laundrie's mom was jealous of Gabby Petito, a handwriting expert has told The U.S. Sun.
Roberta Laundrie's envy over the woman who was strangled to death by her son, 23, in September 2021 was laid bare in her recently released "burn after reading" letter.
The note was released by the Petito family despite the Laundries' attempt to keep it out of the public domain.
Writing to Brian, who died by suicide in the wake of 22-year-old Gabby's murder, Roberta said: "If you're in jail I will bake a cake and put a file in it.
"If you need to dispose of a body. I will show up with a shovel and garbage bags."
She then eerily wrote "burn after reading" on the envelope.
Handwriting expert Sassi says the slanting of her writing gives away a great deal.
"You can see it clearly," Sassi says about the cold and calculating manner of the letter.
"Especially in the line where she says 'I will bake a cake' - the wil' goes one way and the bake goes the other way. She's domineering, and probably was jealous of Gabby."
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The different variations of writing - upward signifies a happy mood while letters that are slanted downward could indicate anxiety and depression - have been studied for years by experts and are regularly used in court cases.
Letters like Roberta's could potentially have a treasure trove of fresh information.
"She's got down-slanted T-bars," added Sassi. "You'll see it essentially in the word guts - it shows someone that wants to dominate and control."
According to court documents, Roberta said the letter only contained references to the books Brian loved as a kid, and that it was written before the fateful road trip with Gabby.
Sassi smells a rat and said: "This is not the content that a normal mother would write to their son."
She also believes because much of the writing fills an entire page, it displays a "need to control their immediate environment."
"It's such cold writing," she adds. "It lacks empathy and shows a need to dominate. The mother and father should both be prosecuted."