He studied acting at the Neue Münchner Schauspielschule [de] and at the Otto Falckenberg School of the Performing Arts.

The script of the episode "Band of Brothers" describes Darius as a monk with a "hideously ugly face",[1] but when the producers cast the part, they chose Stocker, who did not fit this description.

Creative Consultant David Abramovitz explains, "Darius, originally in the script, was written as almost to look like the Hunchback of Notre Dame, to be physically ugly and with a glorious soul.

Producer Bill Panzer remembers that Stocker "had announced that he had a brain tumor,"[5] and that it happened "before we started shooting ["The Hunters"], just before.

"[6] The season 1 promotional booklet recounts, "Just days before going into production actor Werner Stocker was stricken ill and was unable to work.

"[7] The promotional booklet further says, "Footage from previous episodes was successfully used to fill in for the absent actor and the season finale went on to mark a huge shift in the Highlander saga, forever altering the future of the series with the introduction of "Hunters" and "Watchers".