Deadline reports that Alessandro Nivola and Chris Cooper will also star in the film, which is due to begin shooting in Boston in December.
The movie is based on the real-life case of the Boston Strangler, who murdered 13 women in the Boston area during the early 1960s.
It will tell the true story of reporter Loretta McLaughlin, who was the first journalist to connect the murders and to break the story of the Boston Strangler.
She and her fellow reporter, Jean Cole, challenged sexism to report on the notorious case and worked to keep the women of Massachusetts informed of what was happening – risking their own safety in the process.
It has not yet been confirmed which roles the new additions to the cast will play.
Coon rose to fame after starring as Nora Durst in supernatural drama series The Leftovers and as Margo Dunne in psychological drama movie Gone Girl. She has gone on to play Proxima Midnight in Marvel's Avengers: Infinity War and Callie Spengler in Ghostbusters: Afterlife, as well as Amanda Nunn in heist thriller Widows.
Nivola has starred in The Many Saints of Newark, Black Narcissus and Selma, while Cooper is known for his roles in Little Women, A Beautiful Day in the Neighborhood and August: Osage County. He was also nominated for an Academy Award for Best Supporting Actor for his role in Adaptation.
There is currently no confirmed release date for Boston Strangler.
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