'Yellowstone' spinoff 'Marshals' shocks fans by killing off major Dutton family member in premiere
Character died from cancer possibly caused by toxic pollution on the Indian reservation where family lived
{{#rendered}} {{/rendered}}The "Yellowstone" spinoff "Marshals" killed off a key member of the Dutton family during its premiere episode on March 1.
During the premiere episode, titled "Piya Wiconi," Luke Grimes' Kayce Dutton was seen visiting a grave belonging to his wife, Monica Dutton.
"I miss you, baby. I miss my wife — my best friend. My only friend," Kayce said of Monica, who was played by Kelsey Asbille in "Yellowstone."
{{#rendered}} {{/rendered}}Kelsey Asbille and Luke Grimes starred together in "Yellowstone." (Getty Images)
Grimes told Parade that visiting Monica's grave was his favorite scene in the pilot.
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"The whole thing with Kayce and Monica, it’s like Romeo and Juliet, star-crossed lovers sort of thing. And even if she’s not around physically, clearly she’s still very much around. I mean, my favorite scene in the whole pilot is when he goes and visits her grave and sort of just speaks out into nothing to talk to her.
{{#rendered}} {{/rendered}}"So she’s very much a part of the show and very much honored, as people will see, throughout the first season. She gets revisited a lot," he said.
Grimes said that Asbille's character is still "very much a part of the show" despite her character's death. (Roy Rochlin/WireImage)
In the episode, it was revealed that Monica died following a cancer battle, which may have been caused by toxic levels of pollution on the Indian reservation where Monica, Kayce and their son Tate lived.
Grimes revealed that he was "heartbroken" to learn of Monica's fate in the spinoff. He had to work up the courage to call Asbille and inform her of the news.
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"It felt like, ‘I don’t even know what that would look like doing it without her, what that would feel like.’ Kelsey’s become one of my best friends. She’s the coolest actor I’ve ever worked with. She’s down to earth, sweet and kind to every other actor and the crew," Grimes told TV Insider.
Grimes said that he was "heartbroken" about the death of his character's wife. (CBS ©2026 CBS Broadcasting, Inc. )
He continued, "I worked up the courage to call. I didn’t know how she was going to feel about it. I had to see how she was doing."
{{#rendered}} {{/rendered}}Grimes told the outlet that the pair had a "great conversation" and "in true Kelsey fashion, she handled it like a pro and totally understood. She’s going to do just fine."
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Fans were shocked to see Monica being killed off during the first episode.
{{#rendered}} {{/rendered}}Kelsey Asbille originated the character of Monica Dutton on "Yellowstone." (Paramount+)
"Crazy killing off Monica 😢 totally surprised me," a fan commented on the official Marshal's Instagram post.
Another wrote, "Can someone please explain to me what happened to Monica😢😢😢."
"Great first episode, except that Monica was not with her family!" a third user wrote.
{{#rendered}} {{/rendered}}A fan suggested they would boycott "Marshal's" due to Asbille not being in the show. (Omar Vega)
One fan noted they won't be finishing the series since Monica's death.
"Not going to watch. I miss Monica. Without Monica this show is a dud," the user wrote. "I’m so bummed they killed Monica’s character 😢" another user added.