Sir George Martin, the legendary music producer who shaped the Beatles into the world's most important pop music force, has died, Ringo Starr said on Twitter. He was 90 years old.
"God bless George Martin peace and love to Judy and his family," Starr tweeted.
Starr followed the message by posting a photo of the Fab Four with Martin, saying "Thank you for all your love and kindness George."
A Universal Music Group spokesman in Los Angeles confirmed Martin's death but said details were not immediately known.
Martin was referred to as the "fifth Beatle" and served as producer, collaborator and mentor to John Lennon, Paul McCartney, George Harrison and Ringo Starr.