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.

Tamura's supervisor at the Horseshoe Las Vegas legally bought the AR-15-style rifle he sold to Tamura for $1,400, the New York Police Department said Wednesday.

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.