On the morning of January 7, 2010, fifty-five-year-old Terry Joe Mabry was at his workplace, the ABB Power plant in St. Louis, Missouri, when a disgruntled colleague launched a violent assault on the facility. Mabry, a male employee who had worked at the transformer manufacturing plant for years, was outside near the 'winding room' during a shift change around 6:30 a.m.
The shooter, identified as fifty-one-year-old Timothy Hendron, arrived at the complex armed with an assault rifle, a shotgun, and two handguns. Hendron, who was involved in a pending class-action lawsuit against the company regarding retirement funds, began firing in the parking lot before moving toward the buildings.
During the initial volley of gunfire, Mabry was struck in the leg, leaving him unable to walk. Two brave coworkers, Stephen Sharp II and Matt Elder, rushed to his aid and attempted to carry him to safety across the parking lot. However, the gunman, Hendron, spotted the group and advanced toward them, firing his weapon. The intensity of the attack forced the rescuers to retreat for their own survival, leaving Mabry vulnerable on the ground. Witnesses reported that Hendron then walked directly up to the injured man and executed him, firing fatal shots into his head.
The rampage continued as Hendron targeted other employees, ultimately killing two other men, fifty-seven-year-old Carlton Carter and twenty-seven-year-old Cory Wilson, and wounding five others. The attack threw the entire facility into chaos, with workers fleeing to the roof and hiding in boiler rooms to escape the violence. Police tactical teams swarmed the site, but the siege ended before they could intervene. Timothy Hendron was found dead inside an office within the plant, having taken his own life with a single gunshot wound. Because the perpetrator died at the scene, there were no arrests or trials connected to the murders, though the investigation later revealed Hendron’s growing paranoia and dissatisfaction with his employer as the primary motives for the tragedy.
