He played college football for the Minnesota Golden Gophers, and was selected by the New York Jets in the fifth round of the 2019 NFL draft.
[5] On September 15, 2020, Cashman was placed on injured reserve after suffering a groin injury in Week 1.
[14] In Week 6 of the 2023 season, Cashman recorded 15 tackles, two for a loss, and two pass breakups in a 20–13 win over the New Orleans Saints, earning American Football Conference Defensive Player of the Week.
[15] In Week 11 against the Arizona Cardinals, Cashman shifted to the Mike linebacker position with Denzel Perryman suspended and Henry To'oTo'o out with a concussion.
[16] On March 13, 2024, Cashman signed a three-year, $22.5 million contract with the Minnesota Vikings.