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.

After Brian Laundrie returned home without his fiancé, 22-year-old vlogger Gabby Petito, he and his parents didn't cooperate with police.

There have been other documentaries about Petito and Laundrie in recent years, but this one is set apart because it includes extensive interviews with her parents and stepparents. Petito’s mom and stepdad, Nichole and Jim Schmidt, and her dad and stepmom, Joseph and Tara Petito, all took part in the series.