Question: Who is the "My Friend Dahmer" 2017 American biographical drama film, also known as the Milwaukee Cannibal, based on?

Context articles: Stronger (film)
The Glass Castle (film)
Crown Heights (film)
Rebel in the Rye
My Friend Dahmer (film)
Ross Lynch
Marshall (film)
All Eyez on Me (film)
Megan Leavey (film)
Jeffrey Dahmer

Stronger is a 2017 American biographical drama film directed by David Gordon Green and written by John Pollono, based on the memoir of the same name by Jeff Bauman and Bret Witter.
 It follows Bauman, who loses his legs in the Boston Marathon bombing and must adjust to his new life, and stars Jake Gyllenhaal as Bauman, with Tatiana Maslany, Miranda Richardson, and Clancy Brown in supporting roles.
The Glass Castle is a 2017 American biographical drama film directed by Destin Daniel Cretton and written by Cretton, Andrew Lanham, and Marti Noxon, based on Jeannette Walls's 2005 memoir of the same name.
 Depicting Walls's real-life childhood spent squatting in homes and living in poverty, the film stars Brie Larson as Walls with Naomi Watts, Woody Harrelson, Max Greenfield, and Sarah Snook in supporting roles.
 The film was released on August 11, 2017, by Lionsgate and received mixed reviews from critics, who praised the performances of its cast (particularly Larson and Harrelson) but criticized the mishandled tones and material.
Crown Heights is a 2017 American biographical drama film written and directed by Matt Ruskin.
 Adapted from a "This American Life" podcast, the film tells the true story of Colin Warner who was wrongfully convicted of murder, and how his best friend Carl King devoted his life to proving Colin's innocence.
 The film stars Keith Stanfield as Collin Warner and Nnamdi Asomugha as Carl King.
Rebel in the Rye is a 2017 American biographical drama film directed and written by Danny Strong.
 It is based on the book "J. D. Salinger: A Life" by Kenneth Slawenski, about the life of young writer J. D. Salinger during World War II.
 The film stars Nicholas Hoult, Zoey Deutch, Kevin Spacey, Sarah Paulson, Brian d'Arcy James, Victor Garber, Hope Davis, and Lucy Boynton.
My Friend Dahmer is a 2017 American biographical drama film written and directed by Marc Meyers about the American serial killer Jeffrey Dahmer.
 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.
 The film stars Ross Lynch, Alex Wolff, Dallas Roberts, and Anne Heche.
Ross Shor Lynch (born December 29, 1995) is an American singer, songwriter, and actor.
 He is one of the founding members of the pop rock band R5.
 As an actor, he is known for his debut role as Austin Moon on the Disney Channel original series "Austin & Ally", and for his role as Brady in the "Teen Beach Movie" series.
 Lynch is also starring in a new horror/thriller movie called "My Friend Dahmer," where he plays the role of Jeffrey Dahmer in his teenage years.
 The movie is set to debut in the fall of 2017.
Marshall is a 2017 American biographical drama film directed by Reginald Hudlin and written by Michael and Jacob Koskoff starring Chadwick Boseman as the first African-American Supreme Court Justice Thurgood Marshall and one of the first cases of his early career.
 It also stars Josh Gad, Kate Hudson, Dan Stevens, Sterling K. Brown and James Cromwell.
All Eyez on Me is a 2017 American biographical drama film about hip-hop artist Tupac Shakur, directed by Benny Boom and written by Jeremy Haft, Eddie Gonzalez and Steven Bagatourian.
 Titled after Shakur's 1996 fourth studio album of the same name, the film stars Demetrius Shipp Jr. as Shakur with Kat Graham, Lauren Cohan, Hill Harper and Danai Gurira in supporting roles.
Megan Leavey is a 2017 American biographical drama film directed by Gabriela Cowperthwaite and written by Pamela Gray, Annie Mumolo and Tim Lovestedt, based on the true events about young female Marine Megan Leavey and a combat dog named Rex.
 The film stars Kate Mara as the titular character, with Edie Falco, Common, Ramón Rodríguez and Tom Felton in supporting roles.
Jeffrey Lionel Dahmer (May 21, 1960 – November 28, 1994), also known as the Milwaukee Cannibal, was an American serial killer and sex offender, who committed the rape, murder, and dismemberment of seventeen men and boys between 1978 and 1991.
 Many of his later murders involved necrophilia, cannibalism, and the permanent preservation of body parts—typically all or part of the skeletal structure.