Hit TV cop drama The Shield is set to bow out on top with series creator Shawn Ryan considering ending the show at the end of its upcoming fifth series.

The gritty series, which featured Glenn Close last series and will include Forest Whitaker when it airs again next year (06), has become cult viewing in America.

But Ryan insists the show, which stars Michael Chiklis as a corrupt Los Angeles cop, can't go on forever.

He tells America's TV Guide magazine, "I'm ready to head for a finish line. I'm just going to see where the stories take us."