The article discusses a fan theory that Joe Reagan, who died before the start of the TV show "Blue Bloods," might actually be alive and in witness protection. Some fans believe that Joe's investigation into the Blue Templars led to his survival and hiding. However, other fans argue that the theory has too many plot holes and would undermine key moments in the series. While the idea brings potential storylines, it is more likely that Joe should stay dead for the sake of the show's continuity.