former friend slept with minor

A former friend of mine told me last summer that a couple months prior he had sex with a 13 year old girl. He was 21. He said it was 'fantastic', that he loved her body. Puckered lips and OK hand gesture is how he described it.

I sent an email to the police, they said they already did an investigation, left it at that. He's still living his best life.

I want to know if I should post on nextdoor or something similar about what he told me. He is a legitimately shitty person in general (took advantage of a friend); he's always making sexual jokes towards underage girls at his work. I want others to know about this.