Yeah I think the "zombie" thing had to do with drugs.
But the other guy couldn't be... it was too pre-meditated.
Here's what he did if you didn't read into it:
1) Guy is in the gay porn industry.
2) Captured an Asian international student.
3) Ties him to a table and stabs him in the stomach.
4) Cuts his arms and legs off.
5) Has sex with the remaining body.
6) Masterbates with the other guy's hand which was decapitated.
7) Eats part of the body and feeds some to his dog.
8) Sends arm to Republican party in Canada.
9) Sends leg to Democratic part, or vice versa.
10) Records the entire thing and posts it online.
11) Runs off to France...
12) Still running out there.
Not sure what part is the sickest, but that's some fucked up shit right there.