I wouldn't make threats or do anything stupid, but definitely see about filing a police report if possible or see if you can convince an officer to investigate and bring you along.  PM me if you want to verify his address or phone number with what I have.  Don't want too many crazies showing up at his house if there are only loose ties to him at the moment.  It might take a local person to do the leg work first and file a complaint locally to get to the bottom of this.

Also, I see dice.ninja reginfo was updated on the 10th unlike the other sites.  I see what you did there...