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Ryan Jerome McCartan (born June 14, 1993) is an American actor and singer. As an actor, McCartan is known for playing Jason "J.D." Dean in the original Off-Broadway production of Heathers: The Musical and for playing Brad Majors in the 2016 Fox musical television film The Rocky Horror Picture Show: Let's Do the Time Warp Again. He also played the recurring role of Diggie Smalls on the Disney Channel sitcom Liv and Maddie. Wikipedia