The Hacksaw Ridge actor is known for his deep commitment to his roles, but Under the Banner of Heaven‘s dark subject matter forced him to step back in a way he hadn’t before. I spent a lot of time with Mormons: ex-Mormons, gay Mormons, bishop Mormons, detective Mormons.” “I researched a lot and I did all of my preparation in a really deep way. “I prepared heavy in the lead-up to shooting,” Garfield exclusively told Us Weekly ahead of the show’s April 28 premiere. Jeb, a devout Mormon, deals with a crisis of faith as he learns how the Lafferty family’s own beliefs may have led to Brenda and Erica’s deaths. Jeb is investigating the real-life 1984 murder of Brenda Lafferty and her 15-month-old daughter, Erica. The Oscar nominee plays Detective Jeb Pyre in the FX on Hulu drama, which is based on Jon Krakauer‘s 2003 nonfiction book of the same name. Andrew Garfield is the latest star to get in the true crime game with his new series, Under the Banner of Heaven.