Bill Russell, NBA great and Celtics legend, dies at 88

Russell died on Sunday at the age of 88.

His family posted the news on social media, saying his wife, Jeannine, was by his side.

The statement did not give the cause of death.

The most prolific winner in NBA history, Russell marched with Martin Luther King Jr., supported Muhammad Ali and received the Presidential Medal of Freedom from President Barack Obama.

The centerpiece of the Boston Celtics dynasty that won 11 championships in 13 years