He previously played for the Canterbury-Bankstown Bulldogs and Wests Tigers in the NRL and represented the Māori All Stars.

He moved to Sydney, Australia at a young age played junior rugby league for All Saints Toongabbie, before being signed by the Wests Tigers.

[5][6] He spent the majority of 2017 playing for the Tigers in the Intrust Super Premiership NSW competition, making 19 appearances in a side that finished last on the table.

[14] Marshall-King made a total of nine appearances for Canterbury in the 2021 NRL season as the club finished last and claimed their sixth wooden spoon.

[16] In round 1 of the 2023 NRL season, he made his club debut for the Dolphins as hooker in their inaugural game in the national competition, when they pulled off a major upset defeating the Sydney Roosters 28–18 at Suncorp Stadium.