Lester Hayes also stuttered early in life but was able to overcome it with the aid of speech pathologist.
From his Wikipedia page:
Early in his career, Hayes spoke with a
stutter.[url=https://en.wikipedia.org/wiki/Lester_Hayes#cite_note-21][21][/url] However, in the spring of 1981, Hayes overcame his
speech impediment with the benefit of
speech pathologists at the Communications Research Center of
Hollins College in Virginia, as he slowed down in speaking while dropping his voice level from E pitch to C.[url=https://en.wikipedia.org/wiki/Lester_Hayes#cite_note-22][22][/url]