He played college football for the Colorado Buffaloes and was selected by the Seattle Seahawks in the second round of the 2014 NFL draft.

[12] He made his NFL debut in the season opener against the Green Bay Packers but was not targeted.

[13] In Week 3 against the Denver Broncos, Richardson caught his first career NFL reception, which was for seven yards.

[16] In Seattle's opening Divisional Round matchup against the Carolina Panthers, after only having one reception for 21 yards, he went down in the third quarter with what was first believed to be a sprained knee at the time, was later revealed to be a torn ACL upon further inspection.

[17] On December 5, 2015, after making a 40-yard catch, Richardson hurt his hamstring and was subsequently placed on injured reserve.

[18] Richardson had a relatively quiet season again in 2016, until starting wide receiver Tyler Lockett suffered a season-ending injury in Week 16.

[22] On September 9, 2018, Richardson made his Redskins debut, catching four passes for 22 yards in the season-opening win against the Arizona Cardinals.

[28] In Week 3 of the 2019 season against the Chicago Bears, Richardson caught eight passes for 83 yards and a touchdown.