Bee Gee Robin Gibb in a Coma

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British musician Robin Gibb speaks during the awardings of the Goldene Kamera 2011 (golden camera media prize) of the Axel Springer Verlag publishing house on February 5, 2010 in Berlin. AFP PHOTO POOL TOBIAS SCHWARZ (Photo credit should read TOBIAS SCHWARZ/AFP/Getty Images) Photo: TOBIAS SCHWARZ/2011 AFP

Family of the 62-year-old pop and disco star are holding overnight vigils at the private London hospital where he is now in a coma, following a bout of pneumonia. Gibb has been battling colon cancer, which later spread to his liver, and just last month had to receive emergency surgery to remove a blood clot. CNN has now confirmed some earlier rumors that doctors believe there may be a secondary tumor.