Vegas Casino Supervisor Linked to Manhattan Shooting via Rifle Sale

TL;DR
A man who killed four people in a Manhattan office building bought his rifle from his casino boss in Las Vegas, left a suicide note, and had anti-psychotic medication in his apartment. The investigation is ongoing to understand his motives and mental health background.
- Park Avenue Killer Bought Rifle for $1,400 From His Casino Boss The New York Times
- Police: Vegas casino supervisor sold gunman rifle ESPN
- Manhattan mass shooting suspect Shane Tamura's Las Vegas activities investigated ABC News
- An Evening at the Office, and Four Lives Ended by Gunfire The New York Times
- Supervisor at Vegas casino where NYC shooter worked bought gun and sold it to him, law enforcement official says CNN
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