Duthie played Junior hockey for Spokane Chiefs of the WHL. He played for the Chiefs for 3 seasons, totaling 270 points in 198 games. During his final season with the Chiefs, Duthie was named to the Western Conference All-Star team. During his time with the Chiefs, Duthie was twice selected in the NHL Entry Draft; first in 1992 by the New York Islanders 105th overall, and again in 1994 by the Calgary Flames 91st overall.