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Story summary
- Shane Tamura killed four people in July; New York medical examiner confirmed low-stage Chronic Traumatic Encephalopathy (CTE).
- In his suicide note, he accused the National Football League (NFL) of prioritizing profits over safety.
- Tamura’s case raises CTE risk questions in youth football.
- Experts say CTE links to impulsive behavior, but most diagnosed are not violent; Guardian Caps reduce head injuries.
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