Kelsey Asbille played Luke Grimes' onscreen wife, Monica, in Yellowstone - but where is the actress now ahead of the Kayce Dutton spinoff, Marshals? Before booking the role of Monica on Yellowstone, Asbille got her start on Disney as Mikayla in Pair of Kings. She also had a recurring role as Gigi on One Tree Hill before scoring the character of Tracy on MTV's Teen Wolf from 2015 to 2016. Asbille crossed paths with producer Taylor Sheridan on the set of his film Wind River, which paved the way for her role as Monica Long Dutton on Yellowstone.