Riley Green Joins Luke Grimes in Yellowstone Spinoff Marshals

The country music star will play a former Navy SEAL with a mysterious past in the new CBS drama.

Published on Feb. 26, 2026

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Country music star Riley Green is set to join the cast of the upcoming Yellowstone spinoff series Marshals, starring Luke Grimes. Green will play Garrett, a former Navy SEAL who seeks help from Grimes' character Kayce to deal with 'demons of his past.' The two actors are real-life friends, with Grimes previously featuring one of his songs on Yellowstone.

Why it matters

The Yellowstone universe has become known for incorporating country music stars, with Tim McGraw, Faith Hill, and others making appearances. Green's casting continues that trend, while also potentially adding an intriguing new character dynamic as Garrett's mysterious past comes into play.

The details

According to the report, Green's character Garrett will appear in multiple episodes of Marshals, as he tries to convince Kayce and his friend Cal (Logan Marshall-Green) to help him deal with unspecified 'demons of his past.' The nature of these 'demons' is unclear, leaving open the possibility of the show taking an unexpected supernatural turn.

  • Marshals is set to premiere on CBS on Sunday, March 1, 2026, with episodes available to stream the next day on Paramount+.

The players

Riley Green

A CMA and ACM Award-winning country music artist who is making his acting debut in Marshals.

Luke Grimes

The star of the Yellowstone spinoff series Marshals, who is also a singer-songwriter and has previously featured one of his own songs on Yellowstone.

Kayce Dutton

A former Navy SEAL and one of the main characters in the Yellowstone universe, played by Luke Grimes.

Cal

Kayce's friend, played by Logan Marshall-Green, who Garrett seeks help from in Marshals.

Garrett

A former Navy SEAL played by country music star Riley Green, who has a mysterious past that he needs help dealing with.

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What they’re saying

“I'm so excited to be joining the cast of Marshals. Being on set with my buddy Luke Grimes made the experience even more memorable. This is my first go around in the acting space and I couldn't have asked for a better introduction to this world.”

— Riley Green (Variety)

What’s next

Fans will have to tune in to see how Garrett's mysterious past plays out and whether Kayce and Cal decide to help him, when Marshals premieres on CBS on March 1, 2026.

The takeaway

The continued incorporation of country music stars into the Yellowstone universe underscores Taylor Sheridan's commitment to authentically representing the American West, while also potentially adding new dramatic layers to the spinoff series Marshals.