Horizon Scripted Television and Alloy Entertainment are set to begin production on the fourth season of ABC Family's hugely popular teen drama mystery thriller one-hour single-camera television series "Pretty Little Liars". Primetime Emmy Award nominated casting director Bonnie Zane and two-time Casting Society of America Artios Award nominee Gayle Pillsbury are casting actors for guest starring, recurring, and day player roles. Extras are being cast throughout the season. The network has ordered 24 episodes that will shoot beginning on March 15, 2013. The story is set in the fictitious town...