Born in Kimberley, BC, Martineau played junior in the WCJHL with the Estevan and New Westminster Bruins. He was taken 50th overall by the Atlanta Flames in 1972 then scored 22 goals as a rookie pro with the Omaha Knights of the CHL. He spent most of the 1973-74 season in Omaha but did play his first four NHL games in Atlanta.
In May, 1974, Martineau was traded to the Minnesota North Stars. During the 1974-75 season he scored six goals and checked diligently on a line with Henry Boucha and John Flesch. Early the next season Martineau was traded to the Detroit Red Wings for Pierre Jarry. He spent most of his time in the Wings' minor league system but was selected to the CHL first all-star team after firing 27 goals for the Kansas City Blues in 1976-77. Martineau retired after playing one more year with the Blues.
Courtesy of the Hockey Hall of Fame