Who is Special Agent in Charge Isobel Castille on FBI? Alana De La Garza joins cast, replaces Sela Ward
The new Special Agent in Charge on FBI is Isobel Castille. She steps into the void left by character Dana Mosier, who decided to retire during the Season 1 finale of FBI. During Season 2, Episode 1, the CBS audience gets introduced to a number of new characters, including John Boyd as Stuart Scola and