As a true freshman at LSU in 2018, Marshall played in 13 games with one start and had 12 receptions for 192 yards.[6] He returned to LSU in 2019 as one of LSU's top three receivers along with Justin Jefferson and Ja'Marr Chase. Although he missed 3 games due to injury, he still managed to score 13 touchdowns, including 2 vs Georgia in the Southeastern Conference (SEC) Championship, 2 vs Oklahoma in the Peach bowl, and 1 vs Clemson in the College Football Championship game win.[7] Against the Texas Longhorns, Marshall, Jefferson and Chase each had 100 receiving yards, the first time in school history three players had over 100 yards receiving.[8]
On November 29, 2020, Marshall declared for the 2021 NFL draft and opted out of the remainder of the 2020 college football season. Up until that point, Marshall recorded 731 receiving yards and 10 receiving touchdowns (both third in the SEC) in seven games played.[9]
Marshall was selected by the Carolina Panthers in the second round (59th overall) of the 2021 NFL draft.[12] He signed his four-year rookie contract with Carolina on June 17, 2021, worth $5.7 million.[13] As a rookie, he appeared in 13 games and recorded 17 receptions for 138 receiving yards.[14] In Week 9 of the 2022 season, Marshall recorded his first professional touchdown on a 21-yard reception in the 42–21 loss to the Cincinnati Bengals.[15] He finished the 2022 season with 28 receptions for 490 receiving yards and one receiving touchdown in 14 games.[16]
On August 27, 2024, Marshall was waived by the Panthers.[17]
San Francisco 49ers
On August 29, 2024, Marshall was signed to the San Francisco 49ers practice squad.[18] On October 15, Marshall was released by the 49ers.[19]
Las Vegas Raiders
On October 22, 2024, Marshall was signed to the Las Vegas Raiders practice squad.[20] He was promoted to the active roster on November 28.[21]
Personal life
His uncle, Joe Delaney, played in the NFL and died in 1983 attempting to rescue three children from drowning in a pond, before Marshall was born.[22]