Rest in peace, George Martin.

The legendary Beatles producer sadly died on the evening of Tuesday, March 8 from an unknown cause, Ringo Starr confirmed via his Twitter account. George was 90-years-old.

“God bless George Martin. Peace and love to Judy [Lockhart-Smith] and his family, Love Ringo and Barbara [Bach]. George will be missed,” Ringo, 75, wrote on the micro-blogging site.

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George — often known as the “fifth Beatle” — first signed the English rock band to Parlophone in 1962 after they were turned down by several other labels. He went on to produce all of the Beatles’ albums, except one.

george martin beatles getty images

George (second from right) with the Beatles in January 1964.

Following George’s passing, Paul McCartney paid tribute to the man who had been “like a second father” to him on his website. “If anyone earned the title of the fifth Beatle it was George,” Paul, 73, wrote. “From the day that he gave the Beatles our first recording contract, to the last time I saw him, he was the most generous, intelligent and musical person I’ve ever had the pleasure to know.”

George is survived by his wife, Judy, their children, Lucie and Giles, and his children, Alexis and Gregory Paulfrom, his first marriage to Sheena Chisholm.