In the six-month period from August 2015 through February 2016, three episodes of deadly workplace violence occurred on the East Coast, the West Coast and in America's heartland.

August 2015: Two people were killed and one seriously injured in Virginia, when a disgruntled ex-employee shot two former colleagues on live television: 24-year-old Alison Parker, a WDBJ-TV7 news reporter, and Adam Ward, a 27-year-old videographer.

Ward was filming Parker as she interviewed chamber of commerce executive Vicki Gardner, who was seriously injured but survived probably because the killer's Glock ran out of bullets.

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