How do you know if a murderer is still in jail?

i am assuming you should go and check! the best way is to invite him over to your house and see if he shows up! if he does, then most likely he is not still in jail, but then again after you eat a meal with him you may be dead! anyways, if he is still in jail he will not show up at your house. if you do not know his phone number i assume you should ask your best friend, wife, daughter, cat, etc. one of them may know! if you cannot call him i suggest you break into the jail building and go to ask him in person, though be sure to not be carrying any dangerous objects with you! good luck, and i hope he does not show up to dinner, for your sake!