“Desperate Housewives” villain Roger Bart – who plays the show’s pharmacist with a homicidal bent – will join the hit ABC series full-time next season. Bart stole scenes as the creepy George Williams, a lonely man who develops a crush on one of his customers, Bree Van De Kamp (Marcia Cross). In Sunday’s season finale, Bree’s husband Rex apparently died after – unbeknownst to them – a jealous George tampered with his pills. In other casting news, Annabella Sciorra (“The Sopranos”) has joined the cast of NBC’s “Law & Order: Criminal Intent,” playing opposite Chris Noth. Sciorra will play Det. Carolyn Barek to Noth’s Det. Mike Logan; together they’ll front 11 episodes of the series’ fifth season. Duo will alternate with original stars Vincent D’Onofrio and Kathryn Erbe, who will star in the season’s other 11 episodes.