Bill Russell, an NBA legend, died Sunday afternoon.

Russell, 88, passed away peacefully with his wife by his side.

Numerous sports personalities have since offered condolences and thoughts to Russell.

Shaquille O'Neal has posted a touching picture of the couple.

"Thanks for paving the way. Legend, what will miss you," O'Neal posted on Instagram.

Russell and O'Neal are two of the most respected big men in the NBA. They are the best big men in the NBA.

They have won 15 NBA Championships and six NBA MVP titles.

After the 1968-69 season, Russell was a member of the Boston Celtics for 13 seasons. He won two NCAA Championships with San Francisco before that.

Our thoughts and prayers go out to Russell's friends and family during this difficult time.