Marshals confirms Monica Dutton died after cancer linked to toxins

The Marshals premiere, 'Piya Wiconi,' reveals that Monica Dutton died after a sudden battle with cancer. The episode picks up 15 months after Yellowstone's series finale, 'Life Is a Promise.' Kayce, Monica and their son Tate had been living on Yellowstone East Camp after losing their second son and as part of a land deal with the Broken Rock Indian Reservation.

The show says Monica contracted a form of cancer that was seemingly caused by toxins dumped into the reservation's water and soil, and the proposed mine nearby that would add more contamination becomes a focal point for protest. Monica's illness and death happen off-screen and appear to be a rapid decline.

Tate holds a photograph of his mother during the protest, and the episode ends with Kayce at her gravestone, removing any doubt about her fate.

marshals, monica dutton, piya wiconi, yellowstone, kayce, tate, broken rock, toxins, mine protest, cancer