Washington Wizards assistant coach Joseph (JB) Blair was profiled by VegNews.com last week for his vegan diet. Blair also adds that it also helped him live a healthier lifestyle.
In an article by Anna Starostinetskaya, Blair noted that he has been vegan for nine years, and started becoming a vegetarian and pescatarian when he was a college basketball player at Arizona in the early 1990s, helping him stay in shape. He ultimately made the decision to become a vegan after seeing documentaries on animal cruelty in agriculture.
Though Blair is not an NBA player (the closest was when he played a preseason game for the Chicago Bulls), there are other players who are making the switch to becoming vegan, most notably Chris Paul.