In this Nov. 23, 1988, file photo, former world heavyweight boxing champ Muhammad Ali prays with a class of Muslim boys at Dafaalah el Sa'em Mosque in Khartoum, Sudan. (AP)

In this Nov. 23, 1988, file photo, former world heavyweight boxing champ Muhammad Ali prays with a class of Muslim boys at Dafaalah el Sa'em Mosque in Khartoum, Sudan. (AP)
Updated 15 December 2015
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In this Nov. 23, 1988, file photo, former world heavyweight boxing champ Muhammad Ali prays with a class of Muslim boys at Dafaalah el Sa'em Mosque in Khartoum, Sudan. (AP)