He made his debut in round 19 of the 2018 season against West Coast at Bellerive Oval.
He left football for several years to focus on soccer, but returned in 2016, when he was 16, to play for the Sandringham Dragons in the TAC Cup.
[3] Walker impressed in his 2017 season (notably kicking three last-quarter goals in a strong performance against the Western Jets[4]) but was not considered a top-30 draft prospect.
North Melbourne's National Recruiting Manager Mark Finnigan cited his speed as a reason for his selection.
[7] Walker was named as a North Melbourne emergency several times[7] before coach Brad Scott confirmed that he would debut against West Coast in round 19.