The suspect in a deadly Manhattan shooting referenced "CTE" multiple times in a note, according to investigators. CTE (chronic traumatic encephalopathy) is a degenerative brain disease linked to repeated head trauma, often seen in athletes and veterans. While it's unclear if the shooter was formally diagnosed, the mention raises questions about potential connections between brain health and violent behavior—though experts caution against oversimplifying a complex issue.

Editor’s Note: This story matters because it touches on two urgent conversations: gun violence and the long-term effects of brain injuries. While CTE research is still evolving, the shooter’s reference to it adds a grim layer to the tragedy—and highlights how little we understand about the intersection of mental health, brain trauma, and societal harm. It’s not just about one incident; it’s about how we address systemic risks before they escalate.