Kim Kardashian and Cooper Koch visit Erik and Lyle Menendez in prison

Kim Kardashian visited Erik and Lyle Menendez a few days after Ryan Murphy's latest film in the Monster Premiere of the anthology series.

On Saturday, September 21, a source told PEOPLE that Kardashian, 43, and Cooper Koch, who plays Erik in the Netflix series, have been spending time in San Diego at the Richard J. Donovan Correctional Facility, where the two Menendez brothers have been incarcerated since being sentenced to life in prison for the murder of their parents in 1996.

Kardashian and the 28-year-old chef were there to talk to the brothers about the Green Space project, launched by the California Department of Corrections & Rehabilitation to combat high recidivism rates by making life in prison more similar to life on the outside.

Kardashian has been an advocate for prison reform and is studying law since 2018. The reality star helped Alice Johnson get released from a life sentence after reading about her story on X (formerly known as Twitter) in October 2017. In May 2019, she helped negotiate the release of another minor drug offender from prison and met with the then-incarcerated Strike Star Momolu Stewart, who was convicted of murder and served 22 years in prison.

The SKMIS founder has visited the White House several times to discuss prison reform. In April, she participated in a panel discussion with Vice President Kamala Harris on the topic. Kardashian met with Gypsy Rose Blanchard, who is set to be released from prison in December 2023 after serving more than eight years, on a July episode of “The 4000.” The Kardashians to discuss possible changes in the legal system and how Blanchard, 33, could have an impact in this area.

Erik, now 53, and Lyle, 56, shot their parents, José and Kitty Menendez, in their family home in Beverly Hills on August 20, 1989. They were tried three times in connection with the murders. Both brothers claimed that José was physically, emotionally and sexually abusive, and that Kitty was addicted to drugs and alcohol, physically abusive to her husband and enabled the abuse.

In Monster: The Story of Lyle and Erik MenendezKoch plays Erik alongside Nicholas Alexander Chavez' Lyle, and Javier Bardem and Chloë Sevigny play their parents José and Kitty.

Following the series' premiere on Netflix on September 19, Erik posted a statement on Lyle's Facebook page sharply criticizing the portrayal of him and his brother while reflecting on the trauma and abuse they experienced during their childhood.

“I thought we had moved beyond the lies and devastating character portrayals of Lyle, creating a caricature of Lyle based on horrific and obvious lies that were rampant on the show,” Erik began the statement. “I can only believe this was done on purpose. It is with a heavy heart that I must say that I believe Ryan Murphy cannot be so naive and inaccurate about the facts of our lives to do this without malicious intent.”

He continued, “It saddens me to know that Netflix's dishonest portrayal of the tragedies surrounding our crime has pushed painful truths back several steps – back to an era when prosecutors built their narrative on a belief system that said men were not sexually assaulted and that men experienced rape trauma differently than women.”

Erik claimed the depictions of him and his brother were “disgusting and horrific” and accused Murphy, 58, of “disheartening defamation.”

“Is the truth not enough? Then let the truth be truth,” wrote Erik. “How demoralizing it is to know that one man with power can undo decades of progress in educating people about childhood trauma.”

Erik concluded his statement by thanking everyone who “reached out to him and supported him.”

Representatives for Murphy and Netflix did not immediately respond to PEOPLE's request for comment.

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Monster: The Story of Lyle and Erik Menendez is now streaming on Netflix.