There’s an indisputable fact about Lyle and Erik Menendez: The brothers killed their parents, Jose and Mary Louise “Kitty” Menendez, on Aug. 20, 1989, in the den of their Beverly Hills mansion.

But what was the motivating factor behind the murders? Was it greed, as prosecutors contended, or was it retaliation after years of abuse at the hands of their parents, as the brothers alleged?

It is a question that the Netflix series “Monsters: The Lyle and Erik Menendez Story” attempts to answer by dramatizing events and showing different points of view — from the parents, the brothers and those in the family’s circle or some just outside of it. While the latest iteration of Ryan Murphy’s true-crime anthology series is based on the historical events of the case, including the brothers’ trials (the first ended in a mistrial), it also insinuates an incestuous relationship between Lyle and Erik, something that the brothers say is untrue.

Last week, Erik’s wife Tammi Menendez posted a statement on social media from him about the series and how the brothers were depicted, calling it “inaccurate” and that Lyle’s depiction was a “caricature” that was “rooted in horrible and blatant lies.” It was followed by another statement on Wednesday from members of the Menendez family, who expressed support for the brothers and called the series a “grotesque shockadrama.” The statement also disputes the idea of an incestuous relationship, which Murphy said was a theory of Dominick Dunne (played by Nathan Lane in the series), the famed Vanity Fair writer who covered the trials.

Lyle, left, and Erik Menendez in a Beverly Hills courtroom in 1990. The brothers were ultimately convicted of killing their parents, Kitty and Jose Menendez.

(Nick Ut / Associated Press)

In a video interview on Thursday, Murphy responded to the family’s reaction to the series: “I think it’s faux outrage. I think that this story, this Netflix series, is the best thing that has happened to the Menendez brothers in 30 years because it’s getting people to talk about it, and it’s getting people to ask the questions that are important.”

Among those questions are whether the brothers should have another trial and be freed. Just last year, the brothers submitted a petition for a new hearing based on allegations raised in the Peacock docuseries “Menendez + Menudo: Boys Betrayed” by Roy Rosselló, a former member of the Puerto Rican boy band who said he was drugged and raped by Jose, who was then head of RCA Records. Such testimony could support Lyle and Erik’s claims that they were abused by their father.

As for what Murphy would say to the brothers, he wished them luck in their pursuit of a new trial: “I know that they want new evidence to be allowed in. And I think that should probably happen.” Part of Murphy’s goal with the series is to showcase their point of view, “uninterrupted and unchallenged, which did not happen in court.”

“Monsters” also attempts to contextualize the era and how the brothers became enduring pop culture figures despite their notorious crime. Over the decades, the brothers have been subjects in documentaries, loosely portrayed on film and TV, and even parodied in comedies and sketch series. Murphy said he moved to Los Angeles around the time the murders happened, and followed the trials closely over the years, thus his interest.

“Looking back, I thought it would be very interesting to do something where you were very unclear about who the monster was,” said Murphy, who co-created and serves as co-showrunner. “Were the boys the monster? Were the parents the monsters? And what I came to was they all were monsters in different ways.”

The series features newcomers Nicholas Alexander Chavez as Lyle and Cooper Koch as Erik, co-starring with Javier Bardem as Jose and Chloë Sevigny as Kitty. “Monsters” has topped Netflix’s most-watched charts since its release on Sept. 19, spurring a flurry of interest in the case and what actually happened. And that’s likely to be sustained because a new documentary, “The Menendez Brothers,” is slated to be released Oct. 7 on Netflix. It features interviews with the brothers and their cousin Diane Vander Molen, who has said that when Lyle was a child, he told her he was being abused by his father.

Chloë Sevigny stars as Kitty Menendez and Javier Bardem as Jose Menendez.

(Miles Crist / Netflix)

One of the big reasons Murphy wanted to write about the brothers and the case is to start a conversation about sexual abuse, particularly male sexual abuse. “[In] one weekend, [the series is] hugely popular, and people all over the world are having conversations about this many times, for the first time, and I find that very gratifying,” he said.

But the depictions of sexual abuse have come under scrutiny, not just by the family, but by critics and on social media. Though it is the least visually graphic, Episode 5 of the series, titled “Hurt Man,” is one of the most compelling and disturbing as Koch portrays Erik describing in harrowing detail how he was abused by his father and brother. It acts almost like a monologue, with only occasional interruptions by Erik’s lawyer Leslie Abramson, played by Ari Graynor, who questions him about the abuse. It was directed by Michael Uppendahl and written by co-showrunner Ian Brennan. Murphy said it was based on testimony, interviews and lawyer transcripts.

“I had the idea … what would be really interesting is to just have it be one shot, so that you really can’t look away and you can’t claim any other bias other than his truth,” he said. “We rehearsed it like a play … for three days, and then we did it [filmed] two days in a row. And in the 10th take, the last take, is what you see in the cut.

“I’m very proud of that episode because I think it is startling in its honesty about what happens to you if you’re abused, how confused you become when you’re abused, and how that abuse influences everything else in your life,” he added.

Ultimately, it’s why he believes if Erik and Lyle were able to watch the show, “I think they would say, ‘Oh, wow. OK, you did right by me.”

Over the decades, The Times covered the case, from the initial report of the murders to the trials and sentencing, and what’s happened to the brothers since their conviction. Here are some answers to questions about which moments in “Monsters” were rooted in fact.

Were the brothers inspired by the film “Billionaire Boys Club”?

Throughout “Monsters,” we see Lyle and Erik discuss the 1987 film that’s based on a real-life group called the Billionaire Boys Club, an investing and social club that was led by Joe Hunt in the Los Angeles area in the 1980s. In 1984, Hunt was arrested for the murder of Ron Levin, an investor in the group, and later convicted of his slaying. The film dramatized the events and starred Judd Nelson as Hunt.

Prosecutors in the 1993 trial tried to argue that the brothers took cues from the film. They even tried to have the made-for-TV movie played in the courtroom for the jury in an effort to show the similarities between the film and the murders of Jose and Kitty. However, the judge ruled against it.

In the new series, the brothers are seen writing a screenplay with their friend Craig Cignarelli, titled “Friends,” which depicts the son of a wealthy couple who kills his parents and commits more murders. This was based on fact, as reported by The Times, and was one of two screenplays written by the brothers that became key evidence in the murder case.

Did the brothers spend lavishly after they killed their parents?

Yes. Reports state that the brothers went on a shopping spree, buying a Porsche, clothes and more, spending more than $700,000 in the months after their parents’ deaths. It was used as evidence against Lyle and Erik during their trial. The brothers stood to inherit $14 million from their parents’ estate, though over the years that dwindled because of taxes and legal fees.

Did they confess the murders to their therapist, Jerome Oziel?

Yes. In a Dec. 11, 1989, counseling session that Oziel recorded, the brothers confessed to killing their parents. The 2nd District Court of Appeal ruled in 1991 that the tapes were not subject to patient-therapist confidentiality and could be admitted as evidence. The tapes were subsequently played in the courtroom for jurors in 1993. In an article about that day at the trial, Times reporter Alan Abrahamson wrote how, in the tape, Lyle spoke about missing his parents, “and in a comment that set off gasps in the courtroom, Lyle Menendez added: ‘I miss not having my dog around. If I can make such a gross analogy.’”

Did Jose Menendez sexually assault his sons?

That is what Lyle and Erik have said repeatedly over the years and in their testimony at trial. The abuse, which the brothers have described as physical assault and rape, was a key point of their defense and offered as the motivating factor for the murders of Jose and Kitty.

Several people, including family and friends, at the trials and in interviews with journalists said that the brothers told them they were being abused. At the 1993 trial, the brothers’ cousin Andres Cano testified that Erik told him that he was being molested by his father. The Times article about Cano’s testimony also mentions Donovan Goodreau, a roommate of Lyle‘s at Princeton, who said that when he confided to Lyle that he had been molested, Lyle didn’t speak about his abuse, but the defense “confronted him with a 1992 taped interview he gave free-lance writer Robert Rand. In the interview, Goodreau said Lyle Menendez did tell him that Jose Menendez had molested both brothers.”

But the allegations of assault were also challenged. A Times article about Vander Molen’s cross-examination at trial said that “their cousin conceded she told defense lawyers about the abuse only after visiting the brothers in jail.”

Did Lyle assault Erik and did they have an incestuous relationship?

The brothers deny having such a relationship. Murphy said he presented it as one perspective among many as to why the brothers killed their parents.

How is Dunne connected to the brothers?

The journalist (and former film producer) wrote about the trials over the years, including an early article about the murders titled “Nightmare on Elm Drive,” which is mentioned briefly in the series. Murphy said that he and his team did years of research not just on the historical record, but also the many points of view and theories that surrounded the brothers and their crime.

Did a juror really have a heart attack during deliberations?

Yes. Her name was Leigh Valvo. She was the jury foreman in the 1996 trial. After Valvo suffered a heart attack, she was replaced by alternate juror Bruce Seitz, who reportedly persuaded jurors to give the brothers life sentences versus the death penalty.

Where are the brothers now and what has happened since their conviction?

The brothers were sentenced to life in prison without possibility for parole. As seen in the final moments of the last episode, the brothers were taken to separate prisons: Lyle was sent to the California Correctional Institution near Tehachapi and Erik went to the California State Prison — adjacent to Folsom State Prison — near Sacramento. However, after more than two decades apart, they were reunited at San Diego’s Richard J. Donovan Correctional Facility in 2018.

Erik and Lyle appealed multiple times in state and federal courts but ultimately their convictions have been upheld. After the release of “Menendez + Menudo: Boys Betrayed,” the brothers filed a petition asking for their convictions to be vacated or for a new evidentiary hearing, though it could be an uphill battle. No decision has been made on the petition, and it’s unclear when there could be a ruling.