I really enjoyed the first season. But I'm sorry guys, you're being ridiculous. You're dealing with a human, ex partner (sounds somewhat abusive) spirit who (as you say) wants a new face. Why? Well just look at his face!
Stop blaming everything on demons. You're understanding of the occult and these spirits is limited at best. I wish paranormal investigators would actually get more book smart than science smart, as that would actually help you.
You've got a spirit who died in a very horrific manner and told Karen he was going to haunt her. All this other nonsense is just fluff. He needs the work of a reliable necromancer or Egyptian priest/ess to open the gates, piece him back together and send him across to the other side.
Everything these days is blamed on demons when in nearly every instance, its a broken spirit.
Even if you do present that the matter is dealt with, and you managed sleigh Beelzebub LOL The likelihood will be that nothing will change and you have just made it worse.
Human spirits can and likely will be far more dangerous that the "Daemons". When is there going to be some enlightenment in the paranormal community?
I had to write this as my dog is sick of me getting frustrated with the TV.