He was diagnosed with cancer in September .
Byrnes , who was a resident of Fort Mill , S.C. , joined Fox Sports in 2001 and served as a pit - road reporter for its Sprint Cup Series coverage through the 2014 season .
Byrnes was diagnosed with cancer in September .
Byrnes , who was a resident of Fort Mill , S.C. , joined Fox Sports in 2001 and served as a pit - road reporter for its Sprint Cup Series coverage through the 2014 season .