Actor Michael Rosenbaum is set to leave the cast of Smallville at the end of the U.S. TV series' current season.
Rosenbaum, who plays Superman's arch enemy Lex Luthor, has been with the show since it began in 2001 - but has decided to pursue other projects.
In a joint statement, the show's executive producers Darren Swimmer, Todd Slavkin, Kelly Souders and Brian Peterson said, "It has been an honour and pleasure to work with Michael for the past six seasons.
"He is one of the best actors on television and has never failed to bring a new layer to the character of Lex Luthor in every episode.
"While Michael won't be a series regular and we won't have the pleasure of working with him on a weekly basis this fall, we like to think that we haven't seen the last of Lex Luthor. Stay tuned."
Meanwhile, the 35-year-old has penned a handwritten note to thank the show's cast, crew and fans.