Robin Gibb, Former Bee Gees Star, Gravely Ill

Bee Gees star Robin Gibb, 62, remained in a coma after contracting pneumonia while battling cancer

Bee Gees star Robin Gibb remained in a coma Sunday.

The 62-year-old singer has contracted pneumonia while battling cancer. His family has reportedly been keeping vigil at his bedside at a hospital in Chelsea, west London.

A statement on the singer's website said: "Sadly the reports are true that Robin has contracted pneumonia and is in a coma. We are all hoping and praying that he will pull through."

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Gibb had intestinal surgery 18 months ago for an unrelated condition, but a tumor was discovered and he was diagnosed with cancer of the colon and of the liver.

In February, Gibb announced he had made a “spectacular” recovery from cancer, but in March he underwent further surgery on his intestines.

He was forced to cancel all engagements, including the world premiere earlier this month of his first classical work, co-written with his son Robin-John, called “The Titanic Requiem.”

The Bee Gees soundtrack to the 1977 film "Saturday Night Fever," helped propel disco music into a worldwide phenomenon.

Among the band's hits were "I've Gotta Get A Message To You," "Lonely Days," "How Can You Mend A Broken Heart," "How Deep Is Your Love" and "Stayin' Alive."

Gibb last performed on stage in February, supporting injured British servicemen and women at a charity concert held at the London Palladium.

Gibb's twin brother and Bee Gees bandmate Maurice died from the same bowel condition that initially led doctors to operate on Robin.