You can be sued for negligence. If you left the scene of the accident (you do not say whether you saw the sheriff there or later) you can be charged with that. Too many details are left out and there is too much missing information to fully make all the observations about your situation.
Check with a lawyer in your locale to discuss more of the details.
You might find my Legal Guide helpful "How to Choose A Lawyer For You"
You might find my Legal Guide helpful " What Do I Tell My Lawyer"
Good luck to you.
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