Slye signed with the New York Giants on May 6, 2019, but was released eight days later. He was re-signed by the Giants on July 24, but was waived three days later.[6][7]
Carolina Panthers
2019 season
Slye signed with the Carolina Panthers on August 1, 2019.[8] Although originally brought in to serve as a "camp leg", Slye made seven of eight field goal attempts in the preseason, including three from beyond 50 yards out. He was named the Panthers' kicker for the 2019 season after Graham Gano was placed on injured reserve.[9]
Slye made his NFL debut on September 8, 2019, against the Los Angeles Rams, missing his first career field goal attempt from 53 yards out but hitting his next two tries from 46 and 52 yards out while making all three of his extra point attempts.[10] Slye was named the National Football Conference (NFC) Special Teams Player of the Week for Week 4 after going 3–3 on field goal attempts, including a 55-yarder, on September 29, 2019, against the Houston Texans.[11] Slye finished his rookie season with 25 field goals on 32 attempts (78.1%) and made 31 of 35 extra points (88.6%).[12]
Slye signed a one-year extension with the Panthers on February 6, 2020.[13] He made a career-high five field goals on five attempts in a 21–16 victory over the Los Angeles Chargers on September 28.[14] He was placed on the reserve/COVID-19 list by the Panthers on October 21,[15] and was activated two days later.[16] During Week 7 against the New Orleans Saints, Slye attempted an NFL record 65-yard field goal with 1:55 remaining in the fourth quarter, but was short by a few inches as the Panthers lost 27–24.[17] Two weeks later against the Kansas City Chiefs, he missed another record attempt, this time from 67 yards as time expired. The Panthers lost 33–31.[18] During Week 12 against the Minnesota Vikings, Slye missed another game winning field goal with four seconds remaining from 54 yards as the Panthers lost 28–27.[19]
2021 season
Slye signed another one-year contract extension with the Panthers on January 5, 2021.[20] On August 28, he was released after the team traded for Ryan Santoso.[21]
Houston Texans
On September 7, 2021, Slye was signed to the practice squad of the Houston Texans.[22] Four days later, he was elevated to the active roster following an injury to starting kicker Kaʻimi Fairbairn.[23] In three games, Slye connected on 4 of 5 field goal attempts and 7 of 8 extra point attempts.
On October 5, 2021, Slye was signed by the San Francisco 49ers after an injury to Robbie Gould.[25] Slye was waived on November 2, after Gould's return.[26]
Slye signed with the Washington Football Team on November 9, 2021.[27] During Week 12 against the Seattle Seahawks, he suffered a hamstring injury after a blocked extra point attempt and was placed on injured reserve the following day.[28] Slye was activated off injured reserve on December 25.[29]
The team placed a restricted free agent tender on Slye on March 16, 2022,[30] with Slye agreeing to a two-year contract worth around $5 million on April 11.[31]
During Week 10 of the 2022 NFL season against the 8–0 Philadelphia Eagles, Slye played a key part in Washington's 32–21 upset victory. He made all four of his field goals attempts, including a career long 58-yard field goal and another from 55 yards. For this performance, Slye was named NFC Special Teams player of the week.[32] At the end of November 2022, he was named NFC Special Teams Player of the Month for his performance of 37 points, going 7 for 8 on extra points and 10 for 10 on field goals.[33] During Week 13, Slye made two of three field goal attempts, missing a 52-yard attempt in the fourth quarter and with the game resulting in a 20–20 tie against the New York Giants.[34][35]
In Week 8 of the 2023 season, Slye set a Commanders franchise record for the longest field goal made: 61 yards.[36]
On May 2, 2024, Slye signed a one-year deal with the New England Patriots.[39][40] During preseason, Slye beat out incumbent kicker Chad Ryland, who was released at the final roster cutdown.[41] During Week 4, Slye set a Patriots franchise record of the longest field goal made at 63 yards also setting a new career high.[42] He finished the 2024 season converting 26 of 33 field goal attempts and 25 of 26 extra point attempts.[43]
On March 24, 2025, Slye signed with the Tennessee Titans.[44] In Week 5, in a comeback win against the Arizona Cardinals, Slye kicked a game winning 29 yard field goal, as the Titans won 22–21, the first game winning field goal of his career.[45]
On March 13, 2026, Slye re-signed with the Titans on a one-year, $2 million contract.[46]