A Stranger Shattered Their Lives. At First, They Didn’t Know Why.

A family reckons with the devastation left behind after a former N.F.L. player showed up on their property.

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C.T.E. Looms Over Friday Night Lights

Parents revealed conflicting emotions after the finding that a gunman who killed four people in July had the brain disease that has been linked with football and other contact sports.

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Gunman Who Attacked Midtown Office Building Had C.T.E.

Shane Tamura, a former high school football player, shot himself and left behind a note that said his motive was anger at the N.F.L.

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Many Minor Hits Can Damage an Athlete’s Brain, Studies Find

New research in amateur football and soccer players has identified some potential early warning signs of C.T.E.

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‘Something Is Wrong With My Brain’: A Police Officer’s Descent

Brent Simpson is the first police officer known to have C.T.E. He showed signs of the disease in the last few years of his life.

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NYC Gunman Brings Issue of C.T.E. to NFL’s Door

Shane Tamura never played in the league, but the police believe he was seeking vengeance over the handling of head injuries in football.

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Former Football Players With CTE Have Turned to Violence

The gunman in the Manhattan office shooting said in a note that he believed he had C.T.E., a degenerative disease linked by studies to repeated hits to the head.

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Defense Bill Orders Military to Take New Action on Brain Injury

Mandates in the annual appropriations act, passed on Wednesday, call for the Pentagon to track and mitigate risks to troops’ brains from firing their own weapons.

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Top-Gun Navy Pilots Fly at the Extremes. Their Brains May Suffer.

A confidential Navy program is studying whether intense fighter jet operations can cause devastating brain injuries in flight crews.

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