BURNSVILLE — The Voice of the Gophers has fallen silent. Ray Christensen, who did play-by-play for University of Minnesota football games for 50 years, died Sunday afternoon. The College Football Hall of Fame broadcaster was 92. Christensen's son, Jim, said his father died of respiratory failure at Fairview Ridges in Burnsville. Christensen called 510 Gophers football games and 1,309 Gophers men's basketball games on WCCO Radio in a career that covered parts of five decades.