Soul and funk singer who released "Outa-Space" and "Nothing from Nothing" and played the keyboard for The Beatles on "Let It Be" in 1970.
He was convicted of insurance fraud in 1991 after setting fire to his Los Angeles home.
He grew up with his mother and sister after his parent's divorce. His mother worked as a secretary at a funeral home and as a church musician.
He and Ray Charles worked together, including playing jazz organ on Charles' album Genius Loves Company.