One of the best shows on TV is getting ready for a third season this fall and casting is underway for new addition. It was reported this evening that Jimmy Smits isn’t straying far from Miami, signing on to join the cast of Showtime’s hit serial killer drama DEXTER. Smits will star in ten of the 12 episodes greenlit for “Dexter’s” third season. Show returns to the paycabler this fall. He is set to play the ambitious assistant district attorney who comes from a high-profile and powerful Miami family. On the show, a like-able Miami police forensics expert Dexter (Michael C. Hall) moonlights as a serial killer of criminals who he believes have escaped justice. Jennifer Carpenter (Exorcism of Emily Rose) also stars as Dexter’s sis Debra.