Outside of his three Stanley Cup victories Walker also appeared in four other instances where his team played for the Stanley Cup, either in challenge games or in Stanley Cup series: in 1911 with Port Arthur Lake City, in 1919 and 1920 with the Seattle Metropolitans, and in 1926 with the Victoria Cougars. In 1911, 1920 and 1926 he was on the losing side of either the challenge game or the series, and in 1919 the Stanley Cup series between the Seattle Metropolitans and the Montreal Canadiens was cancelled because of the Spanish flu pandemic with the two teams tied at 2-2 in a best-of-five format.