Cops identified a man who sold the weapon to mass shooter Shane Tamura as his former supervisor in the Las Vegas area.

Shane Tamura was a 27-year-old man who opened fire in the 345 Park Avenue offices on July 28 Shane Tamura opened fire in the 345 Park Avenue offices on July 28 He was a 27-year-old man living in Las Vegas who drove to the New York City office Tamura fatally shot at least four people in the building Shane Devon Tamura was identified as the gunman who killed at least four people inside a New York City office building on July 28.