North Port, Florida - The nation was captivated by the search for and death of missing travel blogger Gabby Petito, who was murdered by her boyfriend Brian Laundrie. He was later found to have ended his own life in October 2021, leaving behind a diary – which has now reportedly been revealed.

Photos of Brian Laundrie's found notebook have been newly made public by The Sun and Fox News, and offer frightening insight into the alleged last hours of Petito's life - revealing a possible motive for murder.

In the book, Laundrie wrote that the 22-year-old allegedly seriously injured herself while trying to cross a stream.

"I heard a splash and a scream," the 23-year-old wrote. "I could barely see, I couldn't find her for a moment, calling her name."

Shortly after, he said he found her breathing heavily and gasping for air, her body ice-cold, a small bump emblazoned on her head.

"I carried her as far as I could down the creek to the car, stumbling exhausted, and then my knees gave out and I knew I couldn't carry her safely." He then built a fire on the spot and eventually took her in his arms, he said.

Over and over, Petito reportedly made pitiful sounds, "begging for her pain to end."

The reveal comes just days after Petito's parents appeared in court in their lawsuit against the Laundries, claiming the family withheld information about Gabby's whereabouts causing them "pain and suffering" and "mental anguish."

Brian's chilling words that followed almost certainly prove they knew their son had killed Gabby.

"She kept falling asleep, and I kept shaking her awake because I was afraid that if she had a concussion, she shouldn't close her eyes," Laundrie wrote of Gabby.

"She would wake in pain, start her whole painful cycle again, while furious that I was the one waking her.

"She wouldn't let me try to cross the creek, thought like me that the fire would go out in her sleep, and she'd freeze.

"I don't know the extent of Gabby's injuries, only that she was in extreme pain.

This was followed by the bloodcurdling words: "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."

"From the moment I decided to take away her pain, I knew I couldn't go on without her."

He then wrote about taking his own life.

"I am ending my life, not because of a fear of punishment but rather because I can't stand to live another day without her," Laundrie wrote.

"I rushed home to spend any time I had with my family ... I'm sorry for everyone's loss. Please do not make life harder for my family, they lost a son and a daughter ... Gabby I'm sorry.

"I have killed myself by this creek in the hopes that animal may tear me apart. That it may make some of her family happy.

"Please pick up all of my things. Gabby hated people who litter."

Many on social media are debating over the truth of Laundrie's notebook entry, claiming he killed Gabby in a case of domestic violence and that his confession is a cover-up. Laundrie and Petito had been stopped by police in the weeks before her disappearance for a domestic violence dispute.

Laundrie became the focus of the investigation in August 2021 after he returned home from the couple's trip of cross-country travel without her. After her parents reported her missing, Laundrie and his parents remained silent as the nation searched for the young blogger.

In September, her body was found in Wyoming and it was ruled she died by strangulation. Laundrie disappeared shortly afterwards. In October, Laundrie's body was discovered in Florida after a search, showing he died from a self-inflicted gunshot.

A judge has yet to rule on whether the Petitos' case against the Laudries will go to trial. If it stands, a hearing will take place in 2023.

If you or someone you know need help, please contact the 24-hour National Suicide Prevention Hotline at 1-800-273-TALK (8255) for free and confidential support.