Doctors informed Haggard, who's from a Bakersfield suburb, about a spot on his lung in May. He told The Bakersfield Californian in August that he wasn't going to seek treatment, but friends and family members convinced him otherwise.
Haggard became a household name after the anthem "Okie From Muskogee" hit No. 1 in 1969. He has had 38 No. 1 hits stretching back to 1966.
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