Who is Shane Devon Tamura? What we know about the NYC shooting suspect

A Nevada man who recently drove across the country and has a "documented mental health history" is accused of walking into a Manhattan building with a rifle and opening fire Monday evening, killing four people, including an NYPD officer, police said.

Shane Devon Tamura, 27, went into 345 Park Ave. in midtown just after the end of business Monday armed with an M4 rifle and opened fire in the lobby and again on the 33rd floor before he eventually killed himself, New York Police Commissioner Jessica Tisch said.