The gunman in the deadly shooting at a New York City office tower had a background in casino surveillance and once held a private security guard license.

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

As detectives both in New York and here in Las Vegas work to uncover more details about Shane Tamura’s past, details of his struggles with mental health are bei ...

Despite mental health holds in Nevada, NYC shooter Shane Devon Tamura legally maintained his concealed weapons permit due to ...

The man who shot and killed four people in Manhattan had legally purchased a firearm in Nevada, where he lived, despite a ...

The troubled 48-year-old was placed on an involuntary psychiatric hold twice in the past month amid her divorce ...

The 27-year-old Nevada man left a note at the scene voicing anger that his mental illness may be linked to his having played football, officials familiar with the investigation told NBC News.

Tamura was involuntarily held after being considered a danger to himself or others, according to a law-enforcement official.

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket ...

The 27-year-old man who shot and killed four people at a Midtown office building on Monday carried a note in his pocket, ...

Shane Tamura had a current license to carry a concealed weapon under Nevada law at the time of the mass shooting in New York ...

Gunman Shane Tamura had a ‘documented mental health history’ and ‘sprayed’ the Manhattan office building lobby with a military-style assault rifle, police say ...