Diggs was entering the final year of his contract, which pays a base salary of $1.9 million, and his versatility to play cornerback and safety proved its worth.
Since entering the league in 2015 as a sixth-round pick out of Texas, Diggs has appeared in 44 games with 19 starts. He solidified his position on the roster in 2017 by starting a career-high 11 games, which included making the switch from nickel cornerback to strong safety in December. With the expanded role last year, Diggs produced a career-high 55 tackles, a sack, three interceptions and nine passes defensed.
The extension signals the Lions' trust that Diggs can continue the production to help turn around a pass defense that finished the 2017 season ranked 27th in the league.