 Koch played the role of the Vatican’s secretary Cardinal Marco Malerba, who is one of the true potentates of the inner circle.In an Austrian production of "Bertha von Suttner und" "Alfred Nobel - Eine Liebe für den Frieden", Koch portrayed Alfred Nobel in 2014, and in the French production "Au nom de ma fille", based on a true story, Koch played Dieter Krombach, a German doctor who is accused of murdering his stepdaughter by her biological French father (played by Daniel Auteuil).The case had spanned 30 years and has caused considerable publicity because of the issues of French-German relations and vigilante justice it raised.