‘Monster’ season 3 is about the serial killer who inspired ‘Psycho’ and ‘The Texas Chainsaw Massacre.’ Here’s what we know about Ryan Murphy’s next true crime drama.

At an event promoting “The Lyle and Erik Menendez Story” on September 16, Murphy announced Charlie Hunnam will play Gein in “Monster” season three, The Hollywood Reporter reported.

The outlet also reported that filming for the next season starts in October, which means it will likely arrive on Netflix in late 2025 or early 2026.

Gein was a serial killer and grave robber who was arrested in 1957 after 57-year-old Bernice Worden disappeared in Plainfield, Wisconsin.

When the authorities searched Gein’s home, they found Worden’s decapitated body, as well as numerous other body parts around the property that the killer had used to make items including lampshades, masks, kitchen utensils, and a chair made of skin.

Gein later admitted to murdering two women, as well as exhuming numerous graves from a nearby cemetery to cut off body parts. He was deemed unfit to stand trial in 1958 because he was diagnosed with schizophrenia. 10 years later, he was re-assessed, stood trial, and was found guilty of Worden’s death.

However, he was also judged to be legally insane and was sent to a psychiatric hospital.

The disturbing nature of Gein’s crimes has inspired a number of movies and TV shows.

Director Alfred Hitchcock adapted Robert Bloch’s book “Psycho,” which was inspired by Gein, into the iconic horror movie of the same name.

Gein’s penchant for making household items out of body parts, including a belt made of nipples, meanwhile inspired the slasher movie “The Texas Chainsaw Massacre.”

It’s also not the first time that Murphy has used Gein’s crimes in his work, as he introduced the grisly murderer called Bloodyface with similarly brutal tendencies in “American Horror Story” season two.