Despite being graded by Pro Football Focus as the 10th highest performing cornerback of the 2017 season, Williams was later benched in 2018 and struggled with injuries before being released by the Chargers in October 2019.
He was also a member of the practice squads of the Jacksonville Jaguars and Pittsburgh Steelers in 2020 but did not appear in any games for either team.
[1][2][3][4] He garnered All-Metro and All-Maryland Interscholastic Athletic Association (MIAA) accolades for his junior season in 2010 as the team finished with an 11–1 record and won their first conference championship since 1982.
[1][10] In February 2011, Williams was the offensive Most Valuable Player at the Next Level Nation Elite Showcase.
[1] 2014 saw Williams appear in 12 games, of which he started in all of them, and total 27 tackles, two interceptions, five pass breakups and one forced fumble.
[1] He was named the Big Ten Conference Defensive Player of the Week after recording five tackles and two interceptions against Rutgers on September 13.
[28] Williams also won the Ridge Riley Memorial Award, which is given to the Penn State football player that "exhibits the core values of sportsmanship, scholarship, leadership and friendship.
[33] After going undrafted in the 2016 draft, Williams signed a three-year, $1.62 million contract, with the San Diego Chargers on May 10, 2016.
[34][35] Throughout training camp, he competed for a roster spot and a job as a backup cornerback against Greg Ducre, Richard Crawford, Terrell Chestnut, and Larry Scott.
[37][38] On October 7, the Chargers promoted Williams to the active roster after starting cornerback Jason Verrett partially tore his ACL five days earlier.
[39][40] On October 9, Williams made his professional regular season debut during the Chargers' 34–31 loss at the Oakland Raiders, appearing in 21 snaps on special teams.
[41] In Week 17, Williams recorded a season-high six solo tackles in a 37–27 loss to the Kansas City Chiefs.
[43][41] He finished his rookie season with 31 combined tackles (26 solo) and five pass breakups in 12 games and five starts.
[48] On October 1, he recorded a season-high seven solo tackles and a pass deflection in the 26–24 loss at the Philadelphia Eagles.
[49][48] On November 19, Williams recorded a season-high three pass deflections, three solo tackles, and intercepted Buffalo Bills quarterback Nathan Peterman during Los Angeles' 54–24 victory.
[52] Williams returned as a starting cornerback in 2018 after Verrett tore his Achilles tendon on the first day of training camp.
[53][54] However, Williams himself then suffered an ankle injury early on in training camp that caused him to miss all four of the team's preseason games.
[56] On September 30, he recorded eight combined tackles, made a pass deflection, and returned an interception for an 86-yard gain during a 29–27 win against the San Francisco 49ers in Week 4.