'Yellowstone' spinoff 'Marshals' shocks fans by killing off major Dutton family member in premiere

During the premiere episode, "Piya Wiconi," Luke Grimes' Kayce Dutton visited a grave belonging to his wife, Monica Dutton.

"The whole thing with Kayce and Monica, it's like Romeo and Juliet, star-crossed lovers sort of thing," Grimes said. "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.

"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."

In the episode, it was revealed that Monica died after 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.

"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."

Grimes told the outlet 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."

Fans were shocked to see Monica being killed off during the first episode.

"Crazy killing off Monica