As a freshman, he appeared in all 13 games with four at the nickleback position, tallying 31 tackles, a sack and six pass breakups.[3]
As a sophomore, he became the Sooners starting free safety and was named second-team All-Big 12 Conference after making 60 total tackles with 1.5 sacks and four pass breakups, including a deflection of a pass on a two-point conversion attempt in the final moments of a 30–29 win over TCU.[4]
As a junior, he was named honorable-mention All-Big 12, after recording 63 tackles, two interceptions and four pass breakups.[5]
As a senior, he finished fourth on the team with 63 tackles and third with six pass breakups and received second-team All-Big 12 honors.[6] He finished his collegiate career with 217 tackles (11 for loss), 3.5 sacks, 20 pass breakups, two interceptions, four fumble recoveries and a forced fumble.[7]
Parker was claimed off waivers by the Miami Dolphins on September 1, 2019.[11] He made his NFL debut on September 8, 2019, against the Baltimore Ravens.[12] Parker made his first career start on September 22, 2019, against the Dallas Cowboys, making three tackles and defending a pass in a 6–31 loss.[13] He recorded his first career interception on November 10, 2019, against the Indianapolis Colts, picking off a pass from Brian Hoyer in the end zone in the Dolphins' 16–12 win.[14]
In week 14 against the New York Jets, Parker intercepted his second pass of the season off a pass thrown by Sam Darnold during the 22–21 loss.[15] He finished his rookie season with 20 tackles, three passes defended and two interceptions in 14 games with four starts.[16]
On August 13, 2020, Parker was waived by the Dolphins.[17]
Minnesota Vikings
Parker was claimed off waivers by the Minnesota Vikings on August 14, 2020.[18] He was waived by the Vikings during final roster cuts on September 5, 2020.[19]
Dallas Cowboys
On September 15, 2020, Parker was signed to the Dallas Cowboys practice squad.[20] He was elevated to the active roster on October 10 and October 19 for the team's weeks 5 and 6 games against the New York Giants and Arizona Cardinals, and reverted to the practice squad following each game.[21][22] He was promoted to the active roster on October 22.[23] He was placed on injured reserve on December 7, 2020.[24] On January 2, 2021, Parker was activated off of injured reserve.[25] He appeared in 8 games as a reserve and played mostly on special teams, while collecting 8 tackles.
On August 31, 2021, Parker was waived by the Cowboys.[26]
New York Giants
On September 21, 2021, Parker signed with the New York Giants' practice squad.[27] On November 1, 2021, Parker was signed to the active roster.[28] On November 2, 2021, Parker was waived from the active roster and re-signed to the practice squad.[29][30] On November 22, 2021, Parker was elevated from the practice squad for the game against the Tampa Bay Buccaneers.[31] On November 28,2021, Parker was elevated from the practice squad for the second time this season for the game against the Philadelphia Eagles.[32] On December 4, 2021, Parker was promoted to the active roster.[33]
