Coach Ken Bone said Monday that the senior was dismissed for violation of team rules.
"Reggie has been an important part of the basketball program for the last three years and I wish him the very best in the future," Bone said in a press release.
Washington State spokeswoman Jessica Schmick declined to provide additional details about the dismissal.
A Seattle native, Moore became a starter his freshman year, when he averaged 12 points per game and ranked fifth in the Pac-10 with 4.2 assists per game. He averaged 9 points his sophomore season.
Last year, the 6-foot-1 guard averaged 10 points, third on the Cougars, and 5 assists per game.
Two years ago, Moore served a one-game suspension for marijuana possession.
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