"It was really, really powerful and emotional," says the actor who portrays the convicted murderer in the controversial Netflix series of the face-to-face meeting.

The Lyle and Erik Menéndez Story', tells PEOPLE he "was so nervous" before meeting the brothers with Kim Kardashian

Remarkably, Cooper Koch held back any emotion when Ryan Murphy first told him that he got the part as Erik Menéndez in Netflix’s Monsters. But when Murphy revealed that Koch would have an entire episode to himself that would involve 34 pages of dialogue and one continuous shot,