How to: Forget me not

A dystopian world where the moment someone dies any memory or evidence of that individual disappears with them. This is a biological reality, not caused by the government, a secret organization or even a bacteria. This is how humans have always and will always be. This is a biological function that just happens. However, this story is about a man who has found a loophole to this biological flaw that he is using for his own goals and desires. What will he do with the memories of death that plague his mind in a world where death is instantly forgotten and he is the only one who can figure out how to remember in order to mourn.