(Adds details, background on Ali’s life and career) June 2 (Reuters) – Former world heavyweight boxing champion Muhammad Ali has been hospitalized for a respiratory issue, family spokesman Bob Gunnell said on Thursday. Gunnell said in a statement that Ali was in fair condition but that a brief hospital stay was expected. Ali, 74, has been suffering from Parkinson’s disease for more than three decades and has kept a low profile in recent years.