Question: Who is the "My Friend Dahmer" 2017 American biographical drama film, also known as the Milwaukee Cannibal, based on?
Sentence (from "My Friend Dahmer (film)"): It is based on the 2012 graphic novel of the same name by cartoonist John "Derf" Backderf, who had been friends with Dahmer in high school in the 1970s, soon before Dahmer began his killing spree.
Relevant evidence: No