Muhammad Ali, George Foreman react to Joe Frazier's death

They were once rivals in the boxing ring, taunting each other and landing blows for round after round. But once the boxing was over, Muhammad Ali, George Foreman and Joe Frazier became friends.

When Frazier passed away Monday (Nov. 7) of liver cancer, Muhammad Ali released a short statement: "The world has lost a great champion. I will always remember Joe with respect and admiration. My sympathy goes out to his family and loved ones."

Ali also released a statement upon Frazier's entering into hospice care, saying, ""My family and I are keeping Joe and his family in our daily prayers. Joe has a lot of friends pulling for him, and I'm one of them."

Fellow boxer George Foreman posted to Twitter, "Good night Joe Frazier. I love you dear friend."

Rest in peace, Smokin' Joe.