Marshall was born on September 6, 2002, in Miami, Florida.[1] He attended Miami Palmetto High School in Pinecrest, Florida, where he played both offense and defense but was primarily recruited as a corner.[2] As a senior he helped Palmetto reach the semi-finals of the state playoffs.[3] Following his senior season he was invited to the Under Armour All-American Bowl.[2] A five-star prospect, he committed to play college football at the University of Florida.[4][5][6]
As a freshman in 2021, Marshall would start five games, allowing a completion percentage of 36.8%, the second lowest of any corner in the country.[7] As a sophomore he started all 13 games for the Gators, recording eight pass breakups, 29 tackles and an interception.[8]
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