Police searched Shane Tamura’s employee locker at a Las Vegas Strip casino in their attempts to piece together why he killed ...

Police executed a search warrant at the Las Vegas apartment of Shane Tamura, where the items obtained included a goodbye note ...

Among the dead were a police officer, a security guard and two people who worked at companies in the building. An NFL ...

The NYPD sent detectives to Las Vegas to work with federal law enforcement in the investigation into Monday's deadly shooting ...

The attorney for the man who sold what would become the deadly weapon in a mass shooting in New York City earlier this week ...

A man who killed four people at a Manhattan office building bought the rifle he used in the attack and the car he drove ...

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

The man who stormed a Manhattan office tower with a gun, killing four people before killing himself, worked in the ...

Exclusive video shows SWAT teams executing a search warrant at the Las Vegas apartment of Shane Tamura, the man behind Monday ...

The gunman who opened fire at a Manhattan office building Monday, killing four people before taking his own life, legally ...