CBS Unveils ‘Blue Bloods’ Season 4 Premiere Photos August 28, 2013 ABC, Blue Bloods, News Blue Bloods is preparing for a somber season four premiere that will see the Reagan family divided after the death of a police officer. In the episode, “Unwritten Rules,” Erin and Frank will find themselves at cross-purposes when she drops the charges against the suspected murderer and releases him from custody. Check out the gallery below to see pictures of Frank visiting the graveside of his fallen co-worker. Are you excited for the return of Blue Bloods? Let us know in the comments! Blue Bloods season four premieres Friday, Sept. 27th at 10:00-11:00 PM, ET/PT on CBS. Click Any Photo Below To Enlarge JBQ21 Blue Bloods is a very good show. It gives off vibes of Ray Kelly and the NYPD. This show is in the highest traditions of CBS. Unfortunately, there are other shows on the network of which I cannot say the same. This is particularly true of the evolution of that show which Charlie Sheen carried on his back.