The club was deeply saddened to learn of the passing of Gordon McQueen.
A formidable defender in his playing days, the Scot joined Leeds United in 1972 as a long-term replacement for Boro-bound Jack Charlton, winning the First Division title in 1973/74 and playing in the final of the European Cup the following year.
A move to Manchester United followed, where he scored in a memorable FA Cup final defeat to Arsenal at Wembley in 1979, and eventually lifted the trophy in 1983. He was capped 30 times for his country, once as captain, and was part of the Scottish squad at the 1978 World Cup.
After hanging up his boots, Gordon coached with Airdrieonians and boyhood club St Mirren, before joining Boro in 1995 under friend and former Red Devils teammate Bryan Robson.
Quickly establishing himself as a popular and important figure in what would prove one of the club's most exciting eras, his first role with Boro was reserve team coach, a position he held for five years, before a further two spent in Robson's first team coaching staff.
Leaving Boro alongside Robson in 2001, he returned to the club as a scout in 2008.
He remained in the area following his time with Boro, based in Hutton Rudby, and daughter Hayley was part of the flagship BoroTV channel before going on to become a household name with Sky Sports, where Gordon was also a regular contributor.
Gordon passed away on Thursday morning, aged 70, after a battle with dementia. Our thoughts are with his family and friends.