Lifetime's movie will give viewers a look at the inner lives of the Menendez brothers, and explore their motivation for killing their parents on Aug. 20, 1989.
The Younger and Scream 4 star plays a 21-year-old Lyle, who the movie depicts as the mastermind behind the murders.
For the first time in 20 years, Lyle spoke out about killing his parents in ABC's 2017 special Truth and Lies: The Menendez Brothers – American Sons, American Murderers. "It's shocking to think...that I could have been involved in taking anyone's life—and my parents' life...it seems unimaginable because it seems so far removed from who I am," Lyle said in a phone interview from prison. "But I found that my own childhood prepared me surprisingly well for the chaos of prison life."
Olivier played a head Warbler on Glee before taking on the role of the younger Menendez brother, who was 18 when he murdered his parents, in Lifetime's take on the infamous trial.
The rocker takes on the role of Mary (nicknamed Kitty), Erik and Lyle's 47-year-old mother, who they claimed turned a blind eye to the sexual assault they endured throughout their childhood. In the film, Kitty continues to appear as a ghost visiting Erik after the brothers murder her and Jose.
After memorable turns on American Crime, The Blacklist and How to Get Away With Murder, Martinez takes on the role of the Menendez family patriarch, who the brothers accused of sexually abusing them throughout their childhood, leading to their decision to kill him in 1989. An entertainment executive from Cuba, Jose, 45 at the time of his death, was described as a perfectionist who was extremely hard on his sons.
The Legally Blonde star takes on the role of the criminal defense attorney who represented Erik Menendez during his trials, and came under investigation by the state bar after invoking the Fifth Amendment when asked by the judge if she had Erik's psychiatrist delete and rewrite passages of his notes.