Showtime has renewed serial killer series Dexter for two more seasons.
The pick-up keeps the pay cabler's top-rated drama series on TV for a seventh and eighth season of 12 episodes each. Star Michael C. Hall recently signed a two-season deal with Showtime to remain on the series.
Production on season seven will begin in 2012 in Los Angeles.
During its sixth season, Dexter's ratings have improved every week since its premiere in October, with itsmost recent episode on Nov. 13, delivering almost 2 million viewers at 9 p.m., up 6% from the previous week.
"The series is bigger than it's ever been in its sixth season, both in terms of audience and its impact on the cultural landscape," said David Nevins, Showtime Entertainment president in a statement. "Together with Michael, the creative team on the show has a very clear sense of where they intend to take the show over the next two seasons and, as a huge fan, I'm excited to watch the story of Dexter Morgan play out."