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Leo Held kills 6 at a paper mill in Lock Haven, Pennsylvania
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Janitor goes “berserk” and kills 7 at Cal State Fullerton
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John Felton Parish shoots and kills 6 in Texas after a pay dispute
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USPS worker Patrick Henry Sherrill shoots 20 and kills 14
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An unreturned workplace infatuation escalates to a rampage killing of 7 people
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Joseph Wesbecker turns to mass murder at Kentucky printing company Standard Gravure killing 9 and injuring 12
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Copier repair man Byran Uyesugi shot and killed 7 co workers at Xerox Corp in Honolulu
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Doug Williams shot to death 6 coworkers and himself at Lockheed Martin in Mississippi
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Female postal worker goes on a shooting spree at her former workplace and kills 6 before turning the gun on herself
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Press operator Wesley Higdon shot and killed 5 people at a Kentucky plastics factory
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Nidal Malik Hasan kills 13 and injures 29 in the worst Nidal Malik Hasan kills 13 and injures 29 in the worst shooting incident on a US military base shooting incident on a US military base
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Warehouse driver Omar Thornton shot and killed eight co-workers at a Connecticut beer distributorship
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Andrew Engeldinger opened fire at a Minneapolis sign-making business killing 6 before killing himself
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UPS worker was fired after 21-years. He shot and killed two co-workers before killing himself.
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Syed Rizwan Farook and Tashfeen Malik opened fire at a workplace holiday party killing 14 and injuring 22.
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In Miami’s Coral Gables just last month two supervisors were killed at a trendy fitness club by a disgruntled trainer