Regaon also co-founded the a cappella group the Freedom Singers, who were part of the 1960s civil rights protest group the Student Nonviolent Coordination Committee (SNCC).
His album Reach rode the Billboard 200 for 40 weeks.
The acclaimed actress, who contributed vocals to several songs on the "Popeye" soundtrack, rose to fame in the 1970s before retreating from public view in the 2000s.
The Bon Jovi singer's mom died on Tuesday (July 9) just days before her 84th birthday.
"His legacy will forever live in our hearts," the group captioned its Instagram post honoring the musician.
As a 50-year member of the legendary group, Bonsall was a member of the Grand Ole Opry and the Country Music Hall of Fame, among many others.
Known as a fierce artist champion and musical connector, Martin became an influential A&R rep at labels including RCA, Warner Bros. and Mercury Records starting in the 1970s.
The Jacksonville native was celebrating his 26th birthday prior to being ambushed outside a hotel.
The musician died at home, according to the medical examiner's office.
The musician's health had been in decline for several years, according to his brother, David Siegfried.
