He has been married to Angela Prinzessin von Hohenzollern (née von Morgen) since 1979, and they have one daughter, Sophie. They live in Munich.
His character Harry Klein, the assistant in Derrick, became a cult figure all over the world.
Before playing Klein in Derrick he portrayed the same character on the popular television drama Der Kommissar (1969–1976) from the series' start until 1974 when he was transferred to Derrick. Harry Klein was replaced by his brother Erwin (played by Fritz Wepper's brother Elmar Wepper).