Muhammad Ali's condition has deteriorated since being hospitalized on Thursday with a respiratory infection.
He was placed on life support Friday as his condition worsened and he is in grave condition, according to the Los Angeles Times. As members of Ali's family were at his bedside Friday evening, one source told the Times his death could come within a matter of hours.
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Bob Gunnell, a spokesman for the boxing legend's family, released a statement to multiple news outlets about Ali's condition Thursday that said "a brief hospital stay is expected.