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.

Detectives found prescription medication for depression and epilepsy in the Las Vegas home of Midtown mass shooter Shane Tamura, sources tell The Post.