Exclusive video shows SWAT teams executing a search warrant at the Las Vegas apartment of Shane Tamura, the man behind Monday's deadly shooting in New York City that left four people dead.

The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

Mayor Eric Adams told MSNBC the gunman referenced CTE, a disease linked to head trauma, in a note before killing four people at 345 Park Ave., which houses the NFL.