Pittsburgh Steelers' Super Bowl champion running back Sidney Thornton dies
2017 Record and Fact Book (8.7.17), PDF, Los Angeles Rams
Steelers mourn death of 68-year-old former running back Sidney Thornton
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Sidney Thornton, former Pittsburgh Steelers running back, dies at 68 - CBS Pittsburgh
Sidney Thornton, two-time Super Bowl champion with Steelers, dead at 68
Notable sports deaths in 2023
Sports Cumberland Daily Voice
Sidney Thornton dies: Former Pittsburgh Steelers RB was 68
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Steelers mourn death of 68-year-old former running back Sidney Thornton