What would you do in this situation?

You find out after being with your spouse/partner for twenty years that he/she murdered someone when they were 17 and they were never caught. It was not premeditated.

Do you turn him/her in or do you not say anything and keep the secret?

This is the scenario in a book I’m reading right now

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DunningKruger · 61-69, M

I would need quite a bit of clarifying information about this. If it wasn't premeditated, why did it happen? What happened to the body? Is it a case of they found the body and the family buried it but are still looking for who killed their relative, or is the body still missing and the family doesn't know what happened to that relative? Did the sumbitka need to get kilt, or was it purely accidental and the victim was just in the wrong place at the wrong time? How much have I come to detest my partner in the past 20 years?

These are all relevant data points.