Dexter's future in doubt?

Deadline is reporting that even as Sunday’s sixth-season premiere of 'Dexter' set a ratings record for Showtime, negotiations between the cable network and star Michael C. Hall have reached an impasse that leaves the future of the hit drama in doubt.

The day after the serial killer drama's sixth season premiere became Showtime's most-watched season opener in 14 years contract talks between the shows star and the network broke down.   Hall, who also serves as an executive producer on the show, is reportedly asking for $24 million over the next two seasons; the cable network offered $20 million.

Showtime is still hopeful about striking a deal either for two seasons or one, according to Deadline. Reps for Showtime and Hall had no comment on the report.

Hall, 40, won Golden Globe and Screen Actors Guild awards for his performance in 2009. Before 'Dexter', he starred on HBO's 'Six Feet Under' for five seasons.