Gabby Petito's killer boyfriend Brian Laundrie was seen acting "like a lunatic" two weeks before he killed her in Wyoming, according to notes from the FBI.

FBI reveals letter from Gabby Petito to Brian Laundrie, ... Despite her words, the files reveal that the FBI was quick to launch a kidnapping and murder investigation, ...

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

Murderer Brian Laundrie poured his sick mind onto paper, scrawling notes about his “mania” and doodling skull graphics with the words “Trust no one” and “Kill,” new FBI files ...

Brian Laundrie advised his parents, Christopher Laundrie and Roberta Laundrie, that he had murdered Gabrielle Petito," states the lawsuit, which was obtained by WFLA.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.

The FBI has released 366 pages of investigative reports related to items seized from Brian Laundrie's family home. An investigator says they reveal the depths of Gabby Petito's killer's deception.