https://www.siliconvalley.com/2023/01/24/half-moon-bay-shooting-labeled-workplace-violence-suspected-shooters-dark-history-comes-to-light/

HALF MOON BAY — A day after a mass shooting at two mushroom farms shook this seaside community, horrific details began to emerge of farm workers hiding in portable toilets as a suspected gunman with a dark history opened fire, killing seven.

Officials said Chunli Zhao, the alleged 66-year-old shooter, lived with his wife in what locals describe as a ramshackle collection of trailers and tent-like structures housing a community of Asian and Latino immigrant workers. Court records suggest he may have been prone to violence, attempting to suffocate and threatening to “split (the) head” of a former roommate.