A mushroom farm in Northern California became a kill zone last Monday when 66-year-old Chunli Zhao opened fire on his co-workers in a disgruntled eruption of semi-automatic gunfire. Formerly Mountain Mushroom Farm in Half Moon Bay, California Terra Garden is no stranger to mass shootings. It was at least the second time an employee tried to kill a coworker on the property. Last year, Martin Medina, a manager at California Terra Garden, was charged with attempted murder after he threatened to kill another manager. Medina fired a shot into the man’s trailer. The stray bullet traveled through the trailer and into the home of Yetao Bing, one of the workers slain last Monday. There was no confirmation that Bing was home at the time of the shooting last year. San Mateo County District Attorney Steve Wagstaffe charged Zhao with a total of seven murders and one attempted murder in last Monday’s shootings at California Terra Garden and another farm nearby where, of that seven, three were killed.

Zhao claimed that he was tormented by his co-workers and that, because of an accident between a forklift and a bulldozer, Zhao owed $100 to the farm for repairs. The coroner’s office has named six of the victims: Zhishen Liu, 73, of San Francisco; Marciano Martinez Jimenez, 50, of Moss Beach, California; Aixiang Zhang, 74, of San Francisco; Qizhong Cheng, 66, of Half Moon Bay; Jingzhi Lu, 64, of Half Moon Bay; and Yetao Bing, 43, whose hometown was unknown. An eighth victim, Pedro Romero Perez, survived the shooting. Eric Hove, one of Zhao’s attorneys, did not immediately respond to a phone message seeking comment.