Muhammad Ali in 'Grave Condition' in Phoenix Hospital: Source - NBC Connecticut

Muhammad Ali in 'Grave Condition' in Phoenix Hospital: Source

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    Getty Images for the Michael J. Fox Foundation, File
    Muhammad Ali appears onstage during the Michael J. Fox Foundation's 2010 Benefit "A Funny Thing Happened on the Way to Cure Parkinson's" at The Waldorf-Astoria on November 13, 2010, in New York City.

    A well-informed source tells NBC News that Muhammad Ali is in "grave condition" in a Phoenix-area hospital.

    The 74-year-old former heavyweight champion's family gathered by his bedside just a day after Ali spokesman Bob Gunnell said Ali was hospitalized in what was to be a brief stay.

    Ali has been dealing with advanced Parkinson's disease in recent years — an illness that experts say can lead to complications and can affect patients' breathing. He was previously hospitalized in December 2014 and January 2015 for a severe urinary tract infection.

    He has been on the national stage in recent months, calling for more understanding after Donald Trump suggested banning all Muslims from entering the U.S.