First Look at Dylan O'Brien as Mitch Rapp in "American Assassin". Filming American Assassin has officially begun. O’Brien stars as Rapp, a ruthless CIA black ops recruit under the instruction of Cold War veteran Stan Hurley (Michael Keaton). The pair then is enlisted by CIA Deputy Director Irene Kennedy (Sanaa Lathan) to investigate a wave of apparently random attacks on military and civilian targets. No release date has been set for the film, which is currently shooting in Europe.