Here is the alternate ending. You are not missing anything
Just the brief summary at the ending of the movie is different in the German release as follows below.
After posting these statements online, police found more incriminating evidence in Bill Williamson's house.
He was arrested and sentenced to death.
And of course in other versions it reads
Bill Williamson disappeared that same evening.
2 years later these statements were posted online.
What a disappointment. I thought we were actually going to see him get arrested. The proof is below
http://filenuke.com/e0cx9qpr4hv4