when i googled it i got "gary cooper died at the age of 60 from prostate cancer"
i found it on three diffrent websites.... so i am pretty sure he died of prostate cancer.
hope this helped!,
-garycooperfan forever.
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Gary Sperling died in 24 April 2003 of lung cancer.
Gary Hanekamp died on July 30, 1992, in Santa Paula, California, USA of cancer.
Breast cancer.
What kind of cancer did actor Bob Tessier die from in 1990 ?
Some kind of Cancer.