Michael C. Hall, Dexter Michael C. Hall, Dexter

Showtime has opted to kill two morally bankrupt murderers birds with one stone, picking up Dexter for two more seasons, it was announced on Tuesday.

Seasons 4 and 5 will consist of 12 episodes each, with production to commence this spring in Los Angeles.

"Dexter's enormous success is a tribute to the great achievements of its cast, the producing team, the author of the original book [Jeff Lindsay], and the gifted Michael C. Hall," says Showtime president of entertainment Robert Greenblatt. "I thought at best we would attract adevoted cult audience but soon realized that, ironically, this show is so thematically rich and layered with humanity that audiences of all kinds have flocked to it."

Hall is a two-time Emmy and Golden Globe nominee for his portrayal of Dex, while the series itself was nominated this year for five Emmys, including Outstanding Drama Series.