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Unfortunately, what the insurance company is required to do is based on what type of insurance plan the victim gets. If the insurance plan only covers accidents for uninsured motorists, then the insurance company probably is not required to pursue the claim. To have the insurance company be responsible, the victim probably would have had to get a different plan with higher monthly costs. Everything should be spelled out in the agreement between the victim and the insurance company and if it does not state that the insurance company agrees to pursue such actions, then there is not much that the person can do to get the insurance company to act.
I would suggest hiring a local attorney to pursue the claim