McGary, OKC's first round pick in 2014, was suspended for the first five games of next season by the National Basketball Association for a failed drug test. For maybe the best Thunder team since the franchise left Seattle for Oklahoma City, McGary played just 3.6 minutes per game and only saw action in 20 contests.
Free-agent forward Derrick Williams announced Friday that he has agreed to sign with the Miami Heat.
McGary will serve his suspension beginning with the next game he's physically available to play, which will most likely be at the start of the 2016-17 regular season.
In early April, McGary took a mysterious leave of absence from the Thunder for a couple of weeks, and he declined to explain the "personal matter" when he returned.
McGary had drug issues in college.
The failed drug test comes after McGary, who escaped a one-year college ban after testing positive for marijuana by leaving school for the National Basketball Association, took a leave of absence from the team for a few weeks for what the club dubbed "personal reasons".
McGary said he "clearly made a mistake".
The Thunder just acquired forward Domantas Sabonis in a draft-night trade, and the rookie first-rounder is a threat to push McGary further down the depth chart.