ESPN's Adam Schefter then reported the Chiefs intend to sign the former Houston Texan to a three-year, $42 million deal.
Now that the dust settled, let's examine how the Honey Badger has played recently, and how he fits into the defensive plans of the Chiefs moving forward.
The 26-year-old is one of several big-time safeties on a free agent market that also features the likes of Landon Collins, Earl Thomas, Lamarcus Joyner, Adrian Amos and Ha Ha Clinton-Dix.
On the morning after the news broke that Mathieu had chose to head to Kansas City, Houston made its next move: A source confirmed that 28-year-old safety Tashaun Gipson has agreed to a three-year, $22 million contract with the Texans.
Mathieu can't officially sign until the league year begins on Wednesday, but he can negotiate with teams.
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Mathieu played the 2018 season on a one-year deal with Houston following his release from the Arizona Cardinals.
The Kansas City Chiefs headed into free agency with an obvious need at safety.
It didn't take the Texans long to move on from losing Tyrann Mathieu to the Chiefs on Monday evening.
The Dallas Kimball alumnus recorded 159 combined tackles, six interceptions, 16 pass breakups, and a fumble recovery.