Stiles will play a mysterious woman who becomes entangled with Dexter (stage vet and Gloden Globe Award winner Michael C. Hall) after the death of his wife. Miller's role is unclear, but his storyline will apparently be linked with that of Stiles' character. Moennig will play a tattoo artist, and Weller will be cast as a troubled policeman.

Stiles recently appeared on Broadway and in the West End in David Mamet's Oleanna. Other stage credits include Twelfth Night, Fran's Bed and Vagina Monologues. The stage and screen star ("10 Things I Hate About You, "The Bourne Identity") will next be seen at the Brooklyn Academy of Music in Warren Leight's Persephone.

Miller, who recently appeared in After Miss Julie, has been seen on the London stage in Festen, Democracy and Beautiful Thing. Screen credits include "Emma," "Eli Stone" and "Trainspotting."

Weller's stage credits include Frank's Home, Sticks and Bones, Summer Brave and Full Circle. Screen work includes "Mighty Aphrodite," "Robocop" and "Shoot the Moon."