Thornton attended Booker T. Washington Senior High School in Miami, Florida.

[5][6] Thornton was selected by the New England Patriots in the second round (50th overall) of the 2022 NFL draft.

[9] On September 1, 2022, Thornton was placed on injured reserve after suffering a fractured clavicle in the preseason.

[12] Thornton finished his rookie season with 22 catches for 247 yards and two touchdowns.

[16][17] On November 19, 2024, Thornton was signed to the Kansas City Chiefs practice squad.