'I ENDED HER LIFE': Brian Laundrie's Gabby Petito murder confession made public for 1st time

An image of Gabby Petito used on an FBI poster asking for tips on her whereabouts when she first went missing.
Brian Laundrie and Gabby Petito in a photo she posted to Instagram. Photo credit @gabyspetito/Instagram

TAMPA, Fla. (1010 WINS) -- Brian Laundrie’s confession to killing his fiancé -- 22-year-old Long Island native Gabby Petito -- written in a notebook that was found by his body after he took his own life in a Florida swamp has been made public for the first time.

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"I ended her life," Laundrie, 23, wrote in a notebook obtained by Fox News of Petito. "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."

In the note, Laundrie said he was trying to end Petito’s suffering after she fell and injured herself in Wyoming.

"From the moment I decided, took away her pain, I knew I couldn't go on without her," he wrote.

He also beseeched the public not to harass his family.

"Please do not make life harder for my family," he said. "They lost a son and a daughter. The most wonderful girl in the world. Gabby I'm sorry."

Petito and Laundrie were traveling cross-country in a van when she was reported missing in September.

The FBI discovered her remains at a Wyoming national park and launched a manhunt for Laundrie, who was a person of interest in the investigation.

A month later, Laundrie was found dead of a self-inflicted gunshot wound in Florida.

The FBI recovered the notebook that included Laundrie’s confession from Myakkahatchee Creek Environmental Park near his body.