Police executed a search warrant at the Las Vegas apartment of Shane Tamura, where the items obtained included a goodbye note and a bipod for a rifle.

Shane Tamura, a 27-year-old private investigator from Las Vegas, has been identified as the gunman behind Monday's Midtown Manhattan shooting.

Authorities confiscated several items from a Las Vegas apartment tied to a gunman who used an AR-15-style rifle to kill four people in Manhattan, according to records made public Friday.