[2] Prior to his senior year, he was named defensive most valuable player (MVP) at the Oakland Nike Football Training Camp.

He stated that winning the MVP at the Nike Football Training Camp brought his "confidence up a bit" and that he now knew he could "play with those top guys.

[6] He had a team-high nine tackles (two for loss), a forced fumble, and a recovery against Washington State and finished the year sitting the bowl game out due to injury.

[18][19] Packers director of football operations Eliot Wolf commented that he was excited to add someone with King's size to the team and that he was expected to come in and compete for a starting job right away.

During that time frame, he worked heavily with cornerbacks coach Joe Whitt to get up to speed on the playbook over the phone and via Skype.

[22] Throughout training camp, King competed to a starting cornerback against Damarious Randall, Davon House, Quinten Rollins, and LaDarius Gunter.

[23] Head coach Mike McCarthy named King the fourth backup cornerback on the depth chart to start the regular season, behind Davon House, Damarious Randall, and Quinten Rollins.

On December 6, 2017, the Green Bay Packers officially placed King on injured reserve due a lingering shoulder injury.

[31] During training camp, King competed for a job as a starting cornerback against Davon House, Tramon Williams, Jaire Alexander, and Josh Jackson.

King intercepted a pass by 49ers’ quarterback C. J. Beathard, that was originally intended for wide receiver Marquise Goodwin during the fourth quarter to seal the Packers’ victory.

[36] In King's return from injury in Week 1, he made 5 tackles and sacked Mitchell Trubisky once as the Packers beat the Chicago Bears 10–3.

[39] In Week 16 against the Minnesota Vikings on Monday Night Football, King recorded another interception off a pass thrown by Kirk Cousins which he returned for 39 yards during the 23–10 win.

[40] In Week 15 against the Carolina Panthers, King recovered a fumble lost by Teddy Bridgewater at the 1-yard line and made a 48-yard return during the 24–16 win.

[41] In the NFC Championship Game against the Buccaneers, King struggled throughout the game, failing to making a tackle to stop a rushing touchdown, and allowing two touchdowns in the air, including one to end the first half with no time on the clock in a prevent defense, and he was involved in a controversial pass interference on Tyler Johnson on a critical third-and-four from the Tampa Bay 37-yard line with 1:46 left in the 4th quarter - this penalty sealed the game as Tampa was able to run out the clock by keeping possession with the penalty.

[45] He was named the second cornerback on the depth chart to begin the season, ahead of Chandon Sullivan and rookie Eric Stokes.

After a disastrous first two games, where he allowed 6 catches for 153 yards and a touchdown on 7 targets, King was benched late in the Week 2 victory against the Detroit Lions for the rookie first-round pick Stokes.

[46] King was declared inactive due to an illness ahead of the Packers' Week 3 game against the San Francisco 49ers, and also missed the Week 4 game against the Pittsburgh Steelers, during which first-string cornerback Jaire Alexander was injured and placed on injured reserve (he would not play another regular season snap), presenting King with an opportunity to return to a starting role.

In Week 10, King intercepted a pass by Seattle Seahawks quarterback Russell Wilson in the endzone to preserve a 17–0 shutout victory.