Police have identified the man who they say entered a Midtown Manhattan office building wearing body armor and opened fire, killing four people with a high-powered rifle, as Shane Devon Tamura.

Shane Tamura, the 27-year-old man who shot and killed four people inside a Midtown office building, didn’t show up for his shift as a Las Vegas casino security guard on Sunday, according to authorities.

Wearing body armor and wielding an assault-style rifle, the alleged gunman, identified by police as 27-year-old Shane Tamura, burst through the lobby doors of a 44-story office tower in the heart of Midtown Manhattan on Monday, shooting victims at random, according to authorities.

The gunman who killed four people at an office building in New York City on Monday evening left his home in Las Vegas, Nevada late last week.

Investigators are piecing together more details about how a former high school football player who blamed the game for his mental health problems carried out a deadly attack on an office building that