Selome Hailu Cooper Koch and Nicholas Alexander Chavez have been cast in Season 2 of Ryan Murphy’s “Monster,” Variety has learned. They will play the Menéndez brothers in the Netflix anthology series, which told the story of Jeffrey Dahmer (Evan Peters) in Season 1. Netflix confirmed the subject and title of “Monsters: The Lyle and Erik Menendez Story” in May. This will be the first of the two additional “Monster” installments that Netflix ordered after “Dahmer — The Jeffrey Dahmer Story” became the streamer’s No. 2 most popular English-language series of all time. (It was surpassed by “Wednesday” in December; then recently, Netflix began ranking viewership by estimated viewers instead of total hours viewed, putting “Dahmer” at No. 3 behind “Wednesday” and “Stranger Things” Season 4.)