[1] He was picked up by Manchester United at the age of 12, where Walker was part of the second generation of Busby Babes who were brought through the club after the Munich air disaster.
Walker made his Manchester United debut against Nottingham Forest on 20 May 1963, the last game of the 1962–63 Football League First Division season, when Matt Busby elected to rest several first team players ahead of the 1963 FA Cup Final; Walker thus become United's first ever black player.
[1][2] Although he remained at the club for a time afterward, including being selected for a pre-season tour of Italy ahead of the 1963-4 season, he was unable to displace the likes of George Best, Bobby Charlton and Denis Law from the first team.
[1] Walker was married four times: his best man at his first wedding, shortly after he had joined York City, was former Manchester United team-mate David Sadler.
The bomb detonated shortly after the building had been cleared: Walker himself was flung across the road by the force of the blast and hit the window of a branch of Debenhams, although he was unhurt.