Kayce John Dutton is a horseman and ranch hand, son of ranch owner John Dutton and his wife Evelyn Dutton, married to Monica Long. He is essentially played by Luke Grimes, but Rhys Alterman played a younger version in several flashbacks.
Family & marriage
Click here for the main page of the Dutton family.
Kayce was born on April 24, 1990 into a ranching family. Before his father John Dutton inherited the ranch, his ancestors had already settled in the Yellowstone vicinity. John and Evelyn Dutton were blessed with three more children: Kayce has two brothers (Lee and Jamie) and a sister (Beth). They grew up together on the Yellowstone Dutton Ranch.
His mother died when he was younger. On March 30, 1997 she was out riding with Beth and Kayce and fell off her horse. Beth went to look for help and Kayce - young as he was - tried everything to protect her and stop her from dying, but help came too late and she had breathed her last breath when her husband found her. 
In July that year Kayce's father met Rip Wheeler, an orphan boy that just killed his father after he murdered Rip's mother and brother. John Dutton welcomed the new boy onto his family's ranch, giving the orphan a home again. 
Kayce later started his own family by marrying Monica Long, the granddaughter of Indian elder Felix Long and sister of Robert Long. Kayce and Monica had a son they named Tate and lived on the Broken Rock Indian Reservation. 
His oldest brother Lee died when he was protecting the family ranch in a feud with the Reservation. Kayce was on the scene and saw his brother get shot by Robert Long, Kayce's brother-in-law. He had to kill Robert to protect himself and his brother but found out he was too late as Lee's gunshot wound turned out to be fatal. 
Kayce served in the military for the United States Navy SEALs. He was in Pakistan during one of his missions and was confronted with a high value target that used his family to protect himself. When the man started shooting he couldn't do anything else but start shooting back, killing not only the man but his wife and daughter as well. 
At some point Kayce made it his job to tame wild horses. He did so when he came back from his military service and tried to make a living on the Broken Rock Reservation. 
Yellowstone Dutton Ranch
Click here for the main page of the Yellowstone Dutton Ranch.
When his father gave him a chance to come back on the ranch, Kayce went to live in the bunkhouse and started to work his way back in.  Later on, his father appointed him as the new foreman of the ranch, succeeding his brother Lee and Rip Wheeler,  and he and his family started to live in the ranch house. 
Montana Livestock Association
Click here for the main page of the Montana Livestock Association.
Kayce followed in his father's and brother's footsteps when he started to work as a Livestock Agent of the Montana Livestock Association.  It gave him an higher authority in situations that ask for it. 
- Kayce and Monica were witness to a drug lab explosion close to the road they were driving on. They survived but Kayce had to shoot a man to put him out of his misery. 
- When out driving with Tate he stumbled upon an abandoned van. It turned out there was an abducted girl in it. Kayce had to kill her two abductors and with help from the girl's father tried to keep the happenings hidden.  However, the remains were discovered and he was arrested by the Tribal Police.  With help from his brother Jamie, he was able to explain and go free. 
- Monica was hit when trying to stop a fight between two school boys. She passed out while recovering at home  and in the hospital it turned out she had suffered an epidural hematoma and she had to have brain surgery.  In time of recovery their marriage took a turn for the worse  but it brought Kayce  (and eventually Monica and Tate ) back to his home ranch.
- With Rip Wheeler and some other ranch hands, Kayce took part in the hanging of Dan Jenkins, an enemy of the ranch. They could have let him die then and there but used it as a warning and let him go eventually. 
- There has been some friction between Kayce and Rip Wheeler during the years they have known each other. They got in a fight more than once. At one point they took it far and Rip let Kayce win to let him have the most authority on the ranch. 
- When the rivalry between the Yellowstone Dutton Ranch and businessmen Malcolm & Teal Beck got out of hand, the Becks went after Kayce's son Tate. He was found missing when he was feeding his horse at night. 
Check out the table(s) below to find out in which Yellowstone episodes Kayce made an appearance.
- O = appeared in this episode
- - = did not appear in this episode
- Season 1, episode 3: No Good Horses
- Season 1, episode 8: The Unravelling: Part 1
- Season 1, episode 1: Daybreak
- Season 2, episode 5: Touching Your Enemy
- Season 1, episode 9: The Unravelling: Part 2
- Season 2, episode 2: New Beginnings
- Season 2, episode 7: Resurrection Day
- Season 2, episode 3: The Reek of Desperation
- Season 2, episode 4: Only Devils Left
- Season 1, episode 2: Kill the Messenger
- Season 1, episode 4: The Long Black Train
- Season 1, episode 5: Coming Home
- Season 1, episode 6: The Remembering
- Season 1, episode 7: A Monster Is Among Us
- Season 2, episode 9: Enemies by Monday