Born and raised in Bozeman, Montana, Dissly graduated from Bozeman High School in 2014. During his senior year, the Bozeman Hawks football team won the state championship.[3] He played on both sides of the ball, recording 57 tackles and 11 receiving touchdowns while being named Montana's Gatorade High School Player of the Year.[3] He originally committed to Boise StateinDecember,[4] but then followed head coach Chris PetersentoSeattle to play at Washington.[5]
Dissly first committed to Boise State out of Bozeman High school in Bozeman, Montana [2014]. He was projected to be a defensive end for the Broncos. After his freshman season at Boise State [2014]; Dissly transitioned with one of his coaches to the Washington Huskies his sophomore season in 2015. After his sophomore season at Washington in 2015, he transitioned from defensive endtotight end.[1] His first reception, against Sacramento State, went for a 27-yard touchdown.[2] After garnering only four receptions as a junior, Dissly had 21 catches as a senior in 2017.[6] Most reports projected Dissly as a blocking tight end.[1][3][7]
Dissly was selected by the Seattle Seahawks in the fourth round (120th overall) of the 2018 NFL Draft.[10][11] He quickly became a trusted target of quarterback Russell Wilson. In the season-opening 27–24 loss to the Denver Broncos, Dissly had three receptions for 105 yards and his first professional touchdown in his NFL debut.[12] He followed that up with three receptions for 42 yards and another touchdown in the Monday Night Football loss to the Chicago Bears in Week 2.[13] During Week 4 against the Cardinals in Arizona, Dissly was carted off the field with 7:52 left in the first quarter after a tackle by Cardinals' safety Antoine Bethea. Although the catch resulted in a 5-yard gain, Dissly's rookie season was cut short after suffering a patellar tendon injury, the same injury that had affected Jimmy Graham in 2015.[14]
In Week 2 of the 2019 season against the Pittsburgh Steelers, Dissly caught 5 passes for 50 yards and 2 touchdowns as the Seahawks won 28–26.[15]
In Week 3 against the New Orleans Saints, Dissly caught 6 passes for 62 yards and a touchdown as time expired in the 33–27 loss.[16] In a Week 6 game against the Cleveland Browns, left the game with an Achilles injury.[17] He was later diagnosed with a torn Achilles and was placed on season-ending injured reserve on October 19, 2019.[18]
On March 14, 2022, Dissly signed a three-year $24 million contract extension with the Seahawks.[19] In Week 8, Dissly had a forced fumble and a fumble recovery on special teams in a 27–13 win over the New York Giants, earning National Football Conference Special Teams Player of the Week.[20] He finished the season with a career-high 34 catches for 349 yards and three touchdowns through 15 starts.
On March 5, 2024, Dissly was released by the Seahawks in a cap-saving effort.[21]