Shane Tamura, a former football player at Golden Valley and Granada Hills high schools, entered a New York skyscraper and began spraying bullets, police say.

The gunman who opened fire in a Midtown Manhattan office building left a note that appeared to blame the National Football League for his brain injury, New York Mayor Eric Adams said on Tuesday.

Mayor Eric Adams told MSNBC the gunman referenced CTE, a disease linked to head trauma, in a note before killing four people at 345 Park Ave., which houses the NFL.