Ed Gein biographer Harold Schechter slams ‘Monster’ Season 3, Ryan Murphy

Harold Schechter did not have a killer time watching “Monster: The Ed Gein Story.”

Schechter, a true crime historian and author who wrote the definitive book about Gein, “Deviant: The Shocking True Story of Ed Gein, the Original Psycho,” told The Post that he’s unhappy with the third season of Ryan Murphy’s anthology series, which focuses on Gein and his crimes.

“Ever since I heard that Murphy was planning to make Ed Gein the subject of his third season, I have been feeling aggrieved and resentful because I worried that Ryan and his co-creator, Ian Brennan, were going to kind of rip off my book under the pretext that it was all in the public domain,” Schechter, 77, said.

“After watching the show… I mean there is some unauthorized use of my book I feel, but the show veers so wildly from the reality of the case,” Schechter continued. “So much of it is pure over-the-top fabrication. Now I’m mostly upset that all the people who watch the show are going to think they’re seeing the true story of Ed Gein.”

The author explained that while some parts of the series starring Charlie Hunnam as Gein are accurate, including Gein’s relationship with his mother and his grave robberies, “a very large percentage of the show is just made up.”

“When I watched the very first scene where you see Ed engaged in autoerotic asphyxiation, I’m like, ‘Where did that come from?’” Schechter said. “There’s no evidence whatsoever that Ed ever enjoyed that particular activity.

Schechter also called out the show’s portrayal of Gein’s romance with Adeline Watkins, played by Suzanna Son.

“Their relationship, I’m pretty convinced, didn’t really consist of anything more than possibly maybe Gein once asked her rollerskating or something,” Schechter shared. “They didn’t really have a relationship. You know, she was kind of a publicity hound when all the media descended on Plainfield after the discovery of the crimes. She suddenly came forward as Ed Gein’s girlfriend.”

Other “wildly made up” part of the show, Schechter said, include Gein helping investigators catch Ted Bundy and him being labelled a “serial killer.”

“The term serial killer was specifically coined to describe a certain kind of psychopathic sex murderer. An extreme sexual sadist like Ted Bundy or John Wayne Gacy, who derived erotic pleasure from torturing and then killing victims,” Schechter told The Post. “That was not what Gein was about. I mean, he did kill these two women, but he executed them very swiftly. He was basically just interested in bringing their corpses home so he could dissect them. He was not a serial killer.”

Schechter — who has a new book out, “50 States of Murder: An Atlas of American Crime” — also addressed if he’s considering taking legal action against Netflix, Murphy and Brennan for “Monster” Season 3.

“Before the show came out, I definitely had some discussions with intellectual property lawyers,” he said. “I mean, there might still be enough in there that it would justify some kind of action. But on the other hand, there might not. So I’ll have a discussion with some legal advisors. And if they feel that so much of that was made up and not derived from my book, I’ll just drop the whole matter.”

“Monster: The Ed Gein Story” is streaming on Netflix.