Shane Tamura, the gunman who killed four in a Manhattan office, initially aimed for the NFL's headquarters but got lost. He carried a note blaming the NFL for his mental health issues, linking it to CTE,

Shane Tamura, the Park Ave. gunman who killed an NYPD officer and three others before taking his own life, left behind a suicide note saying he suffered from CTE, a brain injury often linked to playing football, and was targeting the NFL — but took the wrong elevator, officials said Tuesday.