NYC shooting: What to know about Shane Tamura, gunman who killed 4 including NYPD cop in Midtown Manhattan

A lone gunman walked into a midtown Manhattan office building Monday afternoon and opened fire, killing four people – including an NYPD officer – before turning the gun on himself. 

Speaking at a press conference later Monday, NYC Police Commissioner Jessica Tisch identified the shooter as Shane Tamura, a 27-year-old Las Vegas resident with a history of mental health issues. 

Tisch said Tamura had driven across state lines, with his vehicle having been seen as recently as 4:24 p.m.