This is a bit of a strange decision, considering it does not sound like it was the actor’s choice. From the sound of things, this decision came from the AMC drama. It was, apparently, The Walking Dead‘s time jump that served as the fatal blow for Bob. While Curtis Jackson may have been up for it, his character was aged off-screen, making Bob significantly older than he was before, and much more likely to have met his fate via natural causes. Therefore, this made Bob a victim of the time jump.