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Former NFL and Iowa safety Tyler Sash died from an accidental overdose after mixing two powerful pain medications, and a history of painful injuries was a contributing factor, a medical examiner said Tuesday. Additional studies will look at whether Sash, 27, suffered from chronic traumatic encephalopathy, a brain disease caused by repetitive trauma that has been found in several former NFL players. Sash, a standout safety at Iowa who won a Super Bowl during his rookie season with the New York Giants in 2012, was found dead at his home in Oskaloosa, Iowa, on Sept. 8.