Watkins, 24, was the fourth overall pick by the Buffalo Bills in 2014.
Perhaps only now, in his absence, will the Rams learn the true value of receiver Sammy Watkins.
Watkins' departure - which will become official Wednesday, when free agents can sign their new agreed-upon contracts - leaves the Rams with a hole, but one that is hard to define. He had three or fewer catches in 12 of 15 games this past season for the Rams, who elected to place the non-exclusive franchise tag last week on safety Lamarcus Joyner.
Watkins is coming off a 2017 season with the Rams in which he had 39 catches for 593 yards and eight touchdowns in a supporting role.
Last season running back Kareem Hunt (1,782 total yards, 11 touchdowns), tight end Travis Kelce (1,038 yards, eight touchdowns) and wide receiver Tyreek Hill (1,183 yards, seven touchdowns) were all named to the Pro Bowl.
Now, Watkins joins an offense that already has plenty of big-play potential. He also fits the bill of a taller, faster receiver which the Chiefs have been looking for to pair with quarterback Patrick Mahomes.
Watkins initially entered the National Football League with the promise of being one of the game's best receivers.
The Chiefs are making their first free agent splash.
OECD warns of trade war threat to global economic rebound
On the likelihood of a backlash against Mr Trump's threatened tariffs, he added: "This could obviously threaten the recovery". Rebounding global business investment would keep global trade growth at about 5 percent this year, the OECD forecast.
Chiefs set to release Tamba Hali
However, he was released by the Seahawks before the 2011-12 campaign began and landed with the Oakland Raiders. Parker was a free-agent signee by the Chiefs in the 2013 and spent five seasons with the club.