 Complete the following phrase:  Walther formed a partnership with Heidemarie Steiner by around 1965. Coached by Heinz-Friedrich Lindner, they represented SC Dynamo Berlin. The pair won the bronze medal at the 1967 European Championships in Ljubljana and repeated the following year at the 1968 European Championships in Västerås. They were selected to represent East Germany at the 1968 Winter Olympics in Grenoble and placed fourth. After obtaining their third European bronze medal at the 1970 European Championships in Leningrad, the pair concluded their competitive career with a World bronze medal, at the 