Bertz Erik Olov Zetterberg (23 November 1930 â 2 April 2011) was a Swedish Olympic ice hockey player, who was part of the Sweden team that finished 4th at the 1956 Winter Olympics. Zetterberg was part of the DjurgÃÂ¥rden Swedish champions' team of 1950, 1954, 1955, and 1958.