Cassidy on “Yellowstone” was a character who served as an attorney and briefly dated Kayce Dutton. She later became the Livestock Commissioner.
Cassidy, portrayed by Kelly Reilly, is not a central character in the “Yellowstone” series, which may lead to some confusion. The character you might be referring to is actually Monica Dutton, played by Kelsey Asbille, who is Kayce Dutton’s wife. Cassidy Reid, on the other hand, is a minor character played by Kelly Rohrbach. She is introduced in the series as an attorney who prosecutes Kayce for killing a man who was involved in the kidnapping of his brother’s son. After a brief romantic history with Kayce, she eventually becomes the Livestock Commissioner, succeeding Jamie Dutton when he steps down to take over the family ranch.
Cassidy’s role in the series is not as prominent as the main characters, and her storyline is relatively contained within the legal and political aspects of the show’s depiction of ranching and land management in Montana. Her character arc is more focused on her professional life and her interactions with the Dutton family through her official capacity as Livestock Commissioner. Cassidy’s relationship with Kayce is short-lived, and her character serves to highlight some of the complexities and conflicts within the Dutton family and their interactions with state politics.