Police have identified the shooter as Shane Tamura, a 27-year-old Las Vegas resident

The man who killed four people in a rampage with a rifle through a Midtown Manhattan office building was carrying a note that appeared to blame the National Football League for his degenerative brain disease, New York Mayor Eric Adams said on Tuesday.Police have identified the shooter as Shane Tamura, a 27-year-old Las Vegas resident with a history of mental illness struggles, who ended the Monday evening massacre by shooting himself in the chest on the 33rd floor of a Park Avenue office tower.