Lifetime confirms to E! News that Deveaux, a 19-year-old Canadian newcomer, will star alongside Rob Lowe (as prosecutor Jeff Ashton), Elizabeth Mitchell (as fellow prosecutor Linda Drake Burdick) and The Office's Oscar Nuñez (as Anthony's defense lawyer Jose Baez) in the TV flick.
The movie, based on Ashton's book Imperfect Justice, will focus primarily on the attorneys behind Anthony's explosive 2011 trial related to Caylee's disappearance and death in 2008.
But the film's writer, Alison Cross, told the Orlando Sentinel: "It's not our intention to make a movie that tries Casey Anthony for the third time…She was tried in court and she was tried by public opinion."
Cross said filming will "have to go very fast because of Rob Lowe's schedule. But it's all fine."