What happened: Former Dallas Cowboys defensive end Marshawn Kneeland has been diagnosed posthumously with Stage 1 CTE. His family noted that the medical findings provide important context following his recent death by suicide.

Why it matters: The diagnosis adds to the growing documentation of chronic traumatic encephalopathy among former professional football players. Relatives sought the testing to better understand the health factors contributing to his passing.

What to watch: Medical professionals and advocates continue to emphasize the need for advanced study into football-related head trauma.