A press release said Simmons, the Oscar-winning "Whiplash" actor, will play Sergeant Jeffrey Pugliese of the Watertown Police Department, who distinguished himself in combat with Islamic extremists Tamerlan and Dzhokhar Tsarnaev.
Wahlberg will play a composite of several Boston Police Department officers central to the investigation and manhunt.
"Beyond his considerable talents, J.K. Simmons is a person who respects the solemn trust that these real-life heroes are putting in our hands," Berg said in a statement.
"This is an actor who will represent the role in the best way possible."
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