Workers returned to 345 Park Ave., on Monday​ under the watchful eyes of NYPD officers and a surplus of security after the NYC mass shooting.

Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the heart of Manhattan during rush hour.

The man who opened fire at a Midtown Manhattan office building last month, killing four people and injuring another before fatally turning the gun on himself, had a history of run-ins with police in his hometown of Las Vegas,

In this FOX 5 NY News Block, the Las Vegas Metropolitan Police Department has released a series of body camera videos and 911 calls tied to past incidents involving Shane Tamura, the man behind the deadly New York office building shooting last month.