A vampire from the television show, True Blood, Jessica Tuck, will be joining up with the Castle cast on ABC. Jessica will play a guest star that is a rich museum benefactor, who becomes a murderer suspect in an investigation. Jessica and Fillion both got a big acting break from the soap opera, One Life to Live. They did not act together at the same time on the soap opera, they were supposed to be half-siblings on the show. Everyone should be excited because the new Castle Season 4 is coming out soon! Tune in on September 19, 2011 on ABC at 10/9c!