According to act-utilitarianism, what should you do is to Allow the execution and ignore the evidence, keeping your knowledge to yourself.
This is the belief that when one is engaged in any activity what they have to aim for is to get the greatest net utility from it.
Due to the law, the person here would allow the conviction to go on. This is because it would bring about a greater good in the society in the future by dissuading crime.
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