In my opinion I'm thinking by now the sketch person does not exist but there is a chance he could exist, I think it's plausible but not probable that he does exist. I think he would have been identified by now by all the pictures/camera they have in this case. Personally I think it is a dead end but always keep hope alive. I have been following this story for day 1 and just cannot fathom what the family are going through, praying for you Kilen.
It's very frustrating that of all times in the year, it would happen at a halloween party, that makes it a million times harder for LE as obviously everyone is dressed up and can actually hide their identity.