Millar was drafted by the Buffalo Sabres in the 9th round, 225th overall in the 1994 NHL Entry Draft while playing for the Swift Current Broncos of the WHL. After being drafted Millar returned to the Broncos and played another 2 seasons with the team, scoring 77 points in 72 games his final season with the team. For the 2001–2002 season Millar played briefly in Germany and Slovakia before retiring in 2002.