Muhammad Ali's daughter, Hana, revealed that her legendary father's heart was beating for 30 minutes after his organs had failed as he mounted one last fight before passing away on Friday.
Global icon Ali died at the age of 74 in Phoenix, Arizona, after the former world heavyweight champion was admitted to hospital earlier this week with a respiratory illness.
The American, known as "The Greatest', battled Parkinson's disease with incredible courage for more than 30 years.
And the late boxer's daughter, Hana Ali, said his strength of character was still evident in the final moments of his incredible life.
"Our hearts are literally hurting. But we are so happy daddy is free now," she tweeted.
"We all tried to stay strong and whispered in his ear: 'You can go now. We will be okay. We love love. Thank you. You can go back to God now.'
"All of us were around him hugging and kissing him and holding his hands, chanting the Islamic prayer.
"All of his organs failed, but his HEART wouldn't stop beating. For 30 minutes... his heart just keep beating. No one had ever seen anything like it. A true testament to the strength of his spirit and will!
"Thank you all for your love and support!!!"