Erik Menendez is outraged by the new Netflix series about how he and his brother Lyle famously murdered her parents in 1989 … and he says Robert F. Kennedy has made every effort to slander the notorious siblings!

Here’s how it goes… “Monsters: The Lyle and Erik Menéndez Story” premiered on Netflix on Thursday… and dramatically tells what happened before, during and after the brothers shot their wealthy parents. Jose And Mary Louise “Kitty” Menendez.

The real Erik called the series nonsense… and sharply criticized RM for its “naive and inaccurate” portrayal of the brutal house murders that made international headlines.

“I thought we had moved past the lies and devastating character portrayals of Lyle and creating a caricature of Lyle based on horrible and obvious likes that were rampant on the show,” Erik said in a lengthy tirade posted about his wife. Tammi Menendez‘s X-account.

Erik bluntly accuses RM of going to extra lengths to portray the brothers, who were in turn convicted of the brutal murder of their own parents, in the worst possible light by omitting the brothers’ allegations of severe abuse by their father.

“So now Murphy is shaping his horrific story through vile and horrific character portrayals of Lyle and me and disheartening slanders,” says Erik.

As is well known, the brothers were convicted of first-degree murder in 1996 and claimed during the trial that the double murderers committed their crime out of fear for their lives after decades of violent and sexual abuse… and not to gain access to the huge inheritance.

Remember, Menudo member Roy Rosselló claimed that her father, Jose, raped him … and her lawyer Mark Geragos told us last year why Roy’s claim – and a recently discovered letter from Erik – could make all the difference in the event of a retrial in court.