Police videos, 911 calls, and documents are revealing new details about the man who opened fire in a New York City office building last week, killing four. NBC News’ Erin McLaughlin reports.

Newly released body camera footage from Las Vegas police shows past encounters with Shane Tamura, the gunman in last month’s deadly New York office shooting.

LAS VEGAS (KSNV) — The Las Vegas Metropolitan Police Department is releasing new body camera footage related to past incidents involving New York shooter Shane Tamura. The department released the videos via their Public Records Unit's YouTube page Tuesday afternoon, which included seven videos and two 911 audio clips.