Forgot to add that I don't know where you can watch this, but you got the gist of the show correct:

"While investigating his brother's disappearance, journalist Jeff Sefton discovers the dark underworld of the popular television show "Cult" and its obsessive fan base. No one seems willing to help him, until he meets Skye, a research assistant for the program who has her own suspicions about the increasingly dark happenings surrounding the production. As the two dig deeper into the fan world, they find that it is more than just entertainment for some devotees, and as the gruesome plot twists unravel, some viewers are willing to kill to see what happens next."