Photo: KGO-TV via ABC7News

Boston Celtics legend Bill Russell, who was one of the most important and accomplished athletes in history, died on Sunday at the age of 88 with his wife Jeannine by his side, his family announced.

NBA’s all-time leading scorer Kareem Abdul-Jabbar took to Twitter to react to the news: “My thoughts about Bill Russell passing away…. I am working on an deeper thought provoking article tonight as I process what just happened.”