Talks have broken down between Michael C. Hall, who stars as a serial killer in the drama series Dexter, and Showtime, the network that produces the show. The sixth season premiere was watched by a record 2.2 million viewers, up 24 per cent from last year’s debut episode, but because Hall’s contract runs out after this season, a seventh season is not a sure thing. Showtime has offered $20 million for two more seasons, which would make him the highest-paid actor on a cable show, but Hall is holding out for $24 million. If the two sides can’t come to an agreement, production on the series could come to a halt when the current season wraps in the next few months. Speaking to E! Online earlier this year, Hall said: “I’m still enjoying it. You don’t want to overstay your welcome, but the past six years have really flown by.” However, Hall, who won a Golden Globe for his work on the show last year, spent four seasons on Six Feet Under before going directly into Dexter. It’s rumored that after 10 years on television, he wants to move on, with one of his goals being to star in a Broadway musical.