Fact Check: Is Brian Laundrie a serial killer?

Is Gabby Petito not the first person Brian Laundrie has killed? Does he want to kill more?

Dog the Bounty Hunter shared today that he believes Brain Laundrie could be a serial killer, based on books that he has learned that Brian has read in the past, like Lullaby Chuck Palahniuk

It should be noted, that there is no hard, concrete evidence of Brian Laundrie being a serial killer, but a killer is a killer. Hopefully we do not find out there are more victims.