The Kansas City Chiefs entered the 2026 NFL season with a significantly different backfield after moving on from longtime running back Isiah Pacheco and signing Kenneth Walker III as their new featured runner.
Pacheco, who helped Kansas City win two Super Bowls during his four seasons with the franchise, became an unrestricted free agent following the 2025 season and ultimately signed with the Detroit Lions.
So why did the Chiefs let Isiah Pacheco leave?
Isiah Pacheco Became a Free Agent
The first important detail is that Kansas City did not simply release Pacheco before the season.
His rookie contract expired following the 2025 campaign, allowing him to become an unrestricted free agent.
Detroit officially announced the signing of Pacheco on March 12, 2026. He agreed to a one-year contract reportedly worth $1.81 million.
Pacheco finished his four-year Chiefs career with 2,537 rushing yards and 14 rushing touchdowns across 51 games. He also caught 88 passes for 554 yards and three touchdowns.
Chiefs Wanted to Upgrade Their Running Game
Kansas City’s decision became much clearer when the Chiefs made one of the biggest running back moves of 2026 NFL free agency.
The Chiefs signed former Seattle Seahawks running back Kenneth Walker III to a three-year contract worth up to $45 million, including $28.7 million guaranteed.
Walker immediately became the centerpiece of Kansas City’s revamped backfield.
He was coming off a 2025 season in which he rushed for 1,027 yards on 221 carries, averaging 4.6 yards per attempt, while scoring five rushing touchdowns.
The investment in Walker made it clear that Kansas City wanted a different primary option at running back rather than committing significant money to Pacheco.
Pacheco’s Production Had Slowed
Pacheco quickly became a fan favorite after the Chiefs selected him with the No. 251 overall pick in the seventh round of the 2022 NFL Draft.
His aggressive running style and physical approach helped make him an important part of Kansas City’s championship offenses.
However, injuries and declining production complicated his long-term future with the franchise.
By the time his rookie contract expired, the Chiefs had an opportunity to reshape the position rather than make another substantial commitment to Pacheco.
Kansas City chose Walker.
Kansas City Completely Rebuilt Its Backfield
Pacheco wasn’t the only running back who departed.
Kansas City’s official 2026 season preview listed both Pacheco and Kareem Hunt among the team’s offseason departures, while Walker became one of the Chiefs’ biggest additions.
The Chiefs also added other options during the offseason, including Emari Demercado, and later carried Walker, Emmett Johnson and Brashard Smith on their initial 53-man roster.
It represented a significant reset of the running back position.
Kenneth Walker III Became the Chiefs’ New No. 1 Running Back
Kansas City didn’t wait long to give Walker a major workload.
Walker entered the 2026 season as the Chiefs’ top running back and immediately demonstrated the explosive ability Kansas City was looking for.
In his first game with Kansas City, Walker carried the ball 23 times for 173 yards and a touchdown while also catching three passes for 18 yards and another score.
That early production reinforced why the Chiefs were willing to make such a significant investment at the position.
Why Did the Chiefs Move On From Isiah Pacheco?
Ultimately, several factors contributed to the split.
Pacheco’s rookie contract expired, injuries had affected his availability and production, and Kansas City had an opportunity to pursue one of the top running backs available in Kenneth Walker III.
Rather than viewing Pacheco as the unquestioned long-term starter, the Chiefs chose to invest heavily in Walker and rebuild the rest of the running back room around him.
Pacheco then found a new opportunity with Detroit.
Isiah Pacheco’s Chiefs Legacy
Despite his departure, Pacheco leaves Kansas City with an impressive legacy.
A seventh-round draft pick who developed into a starting NFL running back, Pacheco played an important role in Kansas City’s Super Bowl LVII and Super Bowl LVIII championships.
He finished his Chiefs career with more than 2,500 rushing yards and established himself as one of the better late-round selections of the Patrick Mahomes era.
But NFL rosters constantly evolve, and entering 2026 the Chiefs decided it was time for a new direction at running back.
That direction is now centered around Kenneth Walker III.