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He has worked on various projects with Darren Lynn Bousman, who directed the films in the Saw series, on seven projects; Identity Lost, Butterfly Dreams, Saw III, Repo! The Genetic Opera, the Fear Itself episode "New Year's Day", and The Devil's Carnival. Bousman said on the Saw III feature "Darren's Diary" that J. Larose helped him on one of his first short films: Repo! The Genetic Opera (which would later be adapted into a film of its own), which he would use to promote him as a director to Lionsgate. After this worked and he became the director for the Saw films, he had J. Larose came back to play Troy in Saw III. After Saw IV, Darren Lynn Bousman directed a full-length feature film version of Repo! The Genetic Opera, in which J. Larose played the Vanity and Vein reporter who interviews Rotti Largo about Zydrate addiction. J. Larose played the lead in each; Butterfly Dreams and Identity Lost. However, he made his Hollywood film debut in a much smaller role as Troy, a helpless victim of Jigsaw in Saw III. A new commentary track with Darren Lynn Bousman and J. Larose was included on the Director's Cut DVD of Saw III. LaRose also played The Major in The Devil's Carnival from Darren Lynn Bousman and Terrance Zdunich of Repo! fame to be screened on tour beginning in April, 2012.
- Shawnee Smith has fond memories of J. Larose, claiming that her daughter was on set for Troy's torture scene and he, not wanting to scare the little girl, said that he was screaming in the next room over because "there was a rat".