Dear's collaborators turn on him
You might remember that Dear promised to pack up his bags and apologize on camera if he was wrong about this whole Jason theory. Well, if you can believe it, he was somewhat disingenuous about that!
When Levasseur and Mohandie gather to reveal their final takes, it becomes apparent that they were humoring Dear a whole lot during this investigation. Mohandie emphatically believes Jason was not involved, and maintains that Simpson is guilty. Levasseur, in a plot twist, does some legit police work to prove Jason’s time card checks out. He then concludes with the same opinion.
Dear takes this about as well as a kid who’s been cut off from the cookie jar. He repeatedly interrupts both his investigators to yell at them, and even exclaims “That’s bullshit!” after Mohandie dismisses Jason’s diaries. He obviously disagrees, and says so repeatedly.
Levasseur walks back this rare moment of sanity to say he does think there was maybe a second person there. Mohandie makes this concession, too. This is all Dear needs to calm down from his tantrum and promise viewers a grand jury investigation.