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Not much can be done legally. A heart attack is considered an idiopathic condition not related to work. As opposed to having a condition that was exasperated by work to the extent that the work altered the pathology of the medical condition. Thus any type of workers compensation claim is not feasible. You could make the argument that the employer was negligent in not taking him to the hospital for some time sooner, but then there are two issues with such a claim: 1) the employer is not a medical provider and thus is not charged with the duty to have medical knowledge to the extent that its managers must be able to recognize specific symptoms of a heart condition, and 2) it's not at all clear that the heart attack would have/could have been less damaging had they taken him earlier (i.e., did the employer's inaction actually harm him further).