FBI officials walk towards the crime scene at Mountain Mushroom Farm, on Jan. Aaron Kehoe/APSAN FRANCISCO — A farmworker charged with killing seven people at two Half Moon Bay mushroom farms reportedly told investigators he was spurred to carry out the shootings after his supervisor demanded he pay $100 to repair a forklift damaged at work. 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