Hated the ending (spoilers)
He shouldn't have had to die. Maybe let him barely survive and be put away in a psych prison, or maximum security nut house, but die? It's like his real personality we got to know throughout the film, who was a loving father and wasn't even aware of "Charlie", died needlessly because Charlie was a threat at that moment. And dude only had a knife. She could have shot him in a knee cap and run away with Emily to call the cops. Now both the girl's parents are dead.
~ Yeah, well, you know, that's just, like, your opinion, man. ~