If the person I'm depicting is not a confirmed serial killer but there is plenty of evidence that he has already killed many and the evidence against him could possibly make him out to be serial killer is that fine. he was known to do sexual crimes and trafficking though.

Just remember the core elements of the theme/the rules and judged criteria, I have updated them in the description :) If you feel you cannot tell the story without depicting harsh sexual crimes, then it's best to pick a different story/narrative.  As for "not being confirmed" if there is a pile of evidence against this person feel free to study on that as you wish. If it is an ongoing case however, I would say you should pick a different person entirely.