New York City police detectives searched a studio apartment in Las Vegas that belonged to the suspected gunman in Monday's ...

The man who opened fire at a Midtown Manhattan office building last month, killing four people and injuring another before ...

Newly released body camera footage from Las Vegas police shows past encounters with Shane Tamura, the gunman in last month’s ...

The gunman from Las Vegas who committed the mass shooting last week in New York City repeatedly threatened to harm himself, ...

A lone gunman walked into a midtown Manhattan office building Monday and opened fire, killing four people, including an NYPD ...

During evening rush hour in New York City on Monday, a man calmly walked into a Park Avenue office building lobby and killed ...

Nevada's gun laws are again under scrutiny after a Las Vegas man opened fire in Midtown Manhattan, killing four people and ...

Police believe a 27-year-old man travelled across the U.S. from Las Vegas before opening fire in an office tower in Manhattan ...

A man carrying a rifle killed four people at a New York City office tower Monday, including an off-duty New York City police ...

Shane Tamura, 27, fatally shot four individuals at a Manhattan office tower, including an NYPD officer, before taking his own ...

The evidence documents Tamura's years-long struggle with mental health before he opened fire in a Midtown office building.

Former NYPD Sergeant Felipe Rodriguez weighs in on the gunman's actions and what we know about his background.