When Marshals finally premiered on March 1, Yellowstone fans showed up ready to see what life looks like for Kayce Dutton after the ranch. What none of us were quite prepared for was how much that life has changed.

If you noticed Kelsey Asbille’s name missing from the cast list ahead of time, you weren’t alone; fans had been speculating for months about Monica’s absence. Now we have our answer as to where she is—and it’s a heartbreaking one. In the very first episode, there are small hints that something isn’t right. Kayce, played by Luke Grimes, is fumbling through making breakfast for Tate and apologizes, telling his son he knows his mom “was better” at this kind of thing. It was an easy moment to miss if you weren’t paying attention, but it clearly points to something deeper.

The weight of Kayce’s comment builds until later that day, when Tate is seen at a protest on the Broken Rock Reservation holding a framed photo of his mom. That’s when the truth comes into focus: Monica appears to have died of cancer, with her diagnosis seemingly linked to toxic waste dumped near the reservation. Her death isn’t only a personal loss for Kayce and Tate; it’s part of a larger fight affecting the community, and that storyline is expected to carry through the season.

Behind the scenes, Monica’s fate came down to logistics. According to interviews with The Hollywood Reporter, Kelsey Asbille was unavailable for the spinoff, so creators Taylor Sheridan and Spencer Hudnut chose to write the character off in a way that honored her story rather than sidestepping it. Luke Grimes told Entertainment Weekly he was “incredibly bummed” by the decision and “couldn’t imagine” a world for Kayce without Monica in it. But eventually, he came to understand how it would shape his character’s story moving forward. “A person in that kind of pain could do anything,” Grimes said. “There’s something very volatile and very kinetic about that. So at the same time, I did think it was a good idea, even though it was heartbreaking.”

It’s a heavy way to start Kayce’s new story. After everything he’s already been through on Yellowstone, you can’t help but hope this chapter eventually gives him and Tate something better on the other side of all that grief. For now, though, Marshals has made one thing clear: peace never lasts long in the Yellowstone universe, and Kayce’s next chapter is going to test him in entirely new ways.