TVLine’s report about Halper is the second bit of casting to come from Law & Order: True Crime – The Menendez Murders, with the first being TV veteran Edie Falco signing on as attorney Leslie Abramson.
The two brothers were eventually charged with life in prison in 1996 after the high-profile court case that the new project will focus on.
Having popped up just last year on Chicago P.D., Gus Halper will play the younger of the two Menendez brothers, who were convicted of murdering their parents in their Beverly Hills mansion in 1989.
Halper’s real life counterpart, Erik Menendez, went on a spending spree with his brother in the immediate aftermath of the parents’ murders, which eventually raised the eyebrows of investigators who had not previously suspected the siblings in the crime.