The Irishman is eighth on the overall list of appearance-makers at the club, having played 535 times for the Reds.
He scored two goals, in matches against Newcastle United and West Brom, but made his name for his excellent work at the other end of the field in Sir Matt Busby's great side of the 1960s.
The Dublin-born defender joined the club in 1960 from Shelbourne in his homeland, making his debut later that year against Burnley.
It was the beginning of a wonderful spell at Old Trafford,and he started the FA Cup final win over Leicester City in 1963 to collect his first medal with the Reds.