Singer/songwriter Alan O'day has lost his battle with brain cancer at the age of 72.
O'Day was surrounded by loved ones when he passed away at his home in Westwood, California, on Friday (17May13).
He is best known for his 1977 number one hit Undercover Angel, and he also wrote pop tracks for acts including the Righteous Brothers and Cher.
A statement from bosses at 1st Phase Records to Reuters reads, "Alan continued to write and perform until his last days. Alan was a generous man who gave his heart and soul to the music industry."
O'Day's songs have been performed by a number of artists including Sir Tom Jones, Dusty Springfield, Three Dog Night and Paul Anka.
He is survived by his wife, Yuka.
Many ticket-holders couldn't get into the O2 Arena show on Tuesday night (September 19th) because they didn't bring photo ID to match their booking.
An album re-release, a new song and a documentary mark the singer's legacy this year.
The actor plays the titular hero in the forthcoming adaptation.