Ok just watched the s6 ep6 promo & the first thing I noticed was all suspects but Hafner & stiles are wearing a tie , this isn't surprising for stiles but Hafner why is he not wearing a tie & shirt button undone? , we know about the red tattoo & would assume pj is going to make the suspects remove their shirts , I believe Hafner killed the private investigator with the red tattoo. Ok I remember seeing ray Hafner training in one episode I couldn't find which episode pls leave in comments if you find it. So I'm not exactly sure but I think Hafner is wearing a vest which shows his shoulders so some of you may say he can't possibly be the killer but think about it what kind of idiot would leave such a distinctive tattoo visible & not even make sure the victim is dead. So my best guess is The tattoo is either a complete red herring or ray knows one of the other suspects has this tattoo & is framing them. So back to the Hafner not wearing tie & unbuttoned shirt either he was either in a rush after washing off fake tattoo or is just playin with Jane letting him know he knew what was coming.