(CNN) Neil Innes, a writer, musician and "Monty Python" collaborator, has died at the age of 75.

Innes was also part of the Bonzo Dog Doo-Dah Band and The Rutles, a Beatles parody group.

"Neil Innes passed away unexpectedly," his agent, Nigel Morton, told CNN on Monday.

Innes died suddenly of natural causes, according to a statement on his website.

Innes joined the Bonzo Dog Doo-Dah Band while studying at Goldsmiths College School of Art in London in the early 1960s.

The group's biggest-selling single was "I'm the Urban Spaceman," which reached number 5 in the UK charts in 1968. The band broke up in 1970.

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