Forgive me if this has already been mentioned, but, Di Nero was already reported to have been involved in a Malaysian human trafficking ring., so he's more than a suspect. From the article:

"Six people are charged with the running of an international prostitution ring, whose call-girls entertained the actor Robert de Niro, the former tennis player, Wojtek Fibak, two senior (but unnamed) French politicians and several Gulf princes. The agency specialised in tricking, or trapping, star-struck teenage girls into selling their bodies with the promise of careers as models or actresses."