From 2006 to 2010, an average of 551 workers died every year in work-related homicides, according to the Bureau of Labor Statistics.
Seventy-seven of those were multiple-fatality homicide incidents in which two or more workers were killed, including 69 homicides and eight suicides of the assailants.
About 4 out of every 5 workplace homicide victims in 2010 - the last year for which final statistics are available - were men.
A workplace shooting in Hesston, Kansas on Thursday left four people dead and 12 people injured.
Here’s a list of recent workplace shootings that left more than one person dead.
▪ Dec. 2, 2015: 14 people were killed and 22 seriously injured during a terrorist shooting rampage at an office holiday party at the Inland Regional Center in San Bernardino, Calif.
▪ Aug. 26, 2015: Alison Parker and Adam Ward, employees of CBS affiliate WDBJ in Roanoke, Virginia, were fatally shot by former co-worker Vester Lee Flanagan II during a live broadcast. Flanagan fatally shot himself a few hours later after a police chase.
▪ Feb. 23, 2015: An employee of an armed security company opened fire on co-worker Melvin Nieves inside the Moorestown, N.J. business before fatally shooting himself. The shooter, Edgar Figueroa, 42, killed himself. Police said the shooting stemmed from an “ongoing domestic situation.”
▪ Feb. 12, 2015: Truck driver Jeffrey DeZeeuw got into an argument over a delivery with Jon Richter, a supervisor at ProTec, a building manufacturing company in Lennox, S.D. DeZeeuw left the building, then returned and fatally shot Richter and wounded two others before killing himself.
▪ Sept. 23, 2014: After being fired, Rayon Bartley shot his co-worker Jose Raul Cardenas-Ramirez at Renaissance Ross Bridge Golf and Resort Spa in Hoover, Ala. Bartley was arrested and charged with murder.
▪ Sept. 23, 2014: In another multiple shooting in Birmingham on the same day, fired UPS employee Kerry Joe Tesney killed two supervisors, Doug Hutcheson and Brian Callans, before killing himself.
▪ Aug. 1, 2014: After being demoted, Anthony DeFrances, an executive at the Chicago company Arrowstream, shot company CEO Steven Lavoie twice, then killed himself.
▪ April 2, 2014: In a shooting rampage at Fort Hood, Texas, Army Spc. Ivan A. Lopez killed three soldiers and wounded 16 others before shooting himself in the head.
▪ Sept. 16, 2013: Aaron Alexis, a civilian contractor, shot 12 people to death at the Washington Navy Yard before he was killed in a police shootout. Officials at the Navy base in Newport, R.I., failed to forward a report from local police that Alexis had complained about hearing voices coming from the ceiling of his hotel room.
▪ Aug. 24, 2013: Hubert Allen Jr., 72 - step-grandfather to Buffalo Bills running back C.J. Spiller - killed three of his former co-workers at his longtime place of employment, Pritchett Trucking in Lake Butler, Fla. He then killed himself.
▪ June 13, 2013: St. Louis businessman Ahmed Dirir, 59, fatally shot all three of his employees at his home health care agency before killing himself. Surveillance video showed the shooting started after a brief argument in the office.
▪ Sept. 27, 2012: After months spent retreating from his family and stocking up on handguns and ammunition, Andrew Engeldinger fatally shot five people at Accent Signage Systems in Minneapolis, including the company's founder, after he was fired from his job. He committed suicide after the shootings. It was Minnesota’s deadliest workplace shooting.
▪ Aug. 31, 2012: Terence Tyler gunned down two co-workers at a Pathmark supermarket in Old Bridge Township, N.J., who then committed suicide by shooting himself in the head. The ex-Marine had tweeted about killing colleagues three years before the shootings.
▪ Aug. 24, 2012: Fashion designer Jeffrey Johnson, 58, ambushed and killed a former co-worker at point-blank range outside the Empire State Building in New York City. Bullets injured nine people on the street when police shot Johnson to death.
▪ Jan. 13, 2012: In a shooting rampage at a North Carolina lumber yard warehouse, Ronald Dean Davis, 50, killed three co-workers and critically wounded another with a 12-gauge shotgun before going home and fatally shooting himself in the head. Police said Davis might have been harassed at work.
▪ July 2, 2004: At the ConAgra Foods Inc. processing plant in Kansas City, Kan., Elijah Brown, 21, pulled two guns from his locker and hunted down co-workers who reportedly had teased him. When his rampage was over, he had killed five people and himself. It was the worst workplace shooting incident in Kansas City history.