Las Vegas police are helping investigate a local man identified by New York authorities as the gunman in a Manhattan shooting ...

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket claiming he suffered from CTE, asked that his brain be studied and made ...

Authorities say the gunman who opened fire in a Midtown Manhattan office building on Monday night -- killing four people and injuring a fifth -- had a history of mental illness and may have been ...