As a junior he had 55 receptions for 1,250 yards with 15 touchdowns and was named the Shreveport Times Male Athlete of the Year.

[3] A five star recruit, he committed to Louisiana State University (LSU) to play college football.

[8] On November 29, 2020, Marshall declared for the 2021 NFL draft and opted out of the remainder of the 2020 college football season.

[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.

[21] 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.