In this episode of Crimes and Consequences: Workers at the Xerox Corporation of Honolulu, Hawaii in 1999, stalked by an employee who walked into the building with a loaded semi-automatic weapon tucked under his shirt.

SOURCES:
1) State v. Uyesugi (hawaii.gov)
2) Man Opens Fire in Xerox Office, Killing 7 - The New York Times (nytimes.com)
3) Byran Uyegusi | Murderpedia, the encyclopedia of murderers
4) The Chilling Story Behind The Worst Mass Shooting in Hawaii | by The True Historian | Lessons from History | Medium
5) Massacre's 20th Anniversary: Lessons from the Xerox Murders | Hawai'i Public Radio (hawaiipublicradio.org)
6) The Xerox Murders — Examining Workplace Homicide — Crime Library
7) Delusional Disorder: Causes, Symptoms, Types & Treatment (clevelandclinic.org)
8) Honolulu Star-Bulletin Local News (starbulletin.com)
9) Peter Brent Mark (1953-1999) - Find a Grave Memorial
10) John Keiji Sakamoto (1963-1999) - Find a Grave Memorial
11) 20 years ago, a killer shattered the morning calm and changed Hawaii forever (hawaiinewsnow.com)