One of the victims and families of other victims are now suing the mushroom farm where one of the shootings happened.
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The lawsuit alleges the owner of California Terra Garden Mushroom Farm failed to properly respond to previous reports of violent incidents and take steps to prevent others.
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Four workers were killed at the Mushroom farm and three others died at a second farm.
Investigators say the shooter acted after a dispute with his supervisor.
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The lawsuit seeks unspecified damages for economic losses related to the deaths and injuries.