Wales and British and Irish Lions winger JJ Williams has died at the age of 72.
Williams, who was christened John James but known throughout the world of rugby by his initials, was one of the finest finishers the game has seen.
One of his former clubs Bridgend Ravens tweeted: "All at Bridgend Ravens are deeply saddened to hear of the passing of former player JJ Williams. Our thoughts are with JJ's family and friends at this tough time."
Another former club Llanelli tweeted: "It is with great sadness that we hear of the passing of the great JJ Williams. We would like to extend our sincerest condolences to his family, friends and former teammates."
He scored 12 tries in 30 appearances for Wales and won Grand Slams in 1976 and 1978, as well as four Triple Crowns between 1976 and 1979.
Williams toured South Africa in 1974 and New Zealand in 1977 with the Lions and his try-scoring exploits put him into the tourists' record books.
He equalled David Duckham's record of six tries in a single Lions game during a 97-0 victory over South West Districts in 1974.
Williams scored four tries in the subsequent 3-0 Test series triumph against South Africa, becoming only the second Lions player to score two tries twice in a Test.
He scored another Test try in New Zealand three years later and his five-try Test haul is only second to Ireland's Tony O'Reilly, who crossed six times during the Lions tours of 1955 and 1959.
Scarlets - the PRO14 club based in Llanelli - tweeted: "We are deeply saddened to hear that our former player JJ Williams has passed away. JJ played 223 games for Llanelli RFC in nine seasons at Stradey Park.
"Our thoughts are with JJ's family, many friends and former team-mates at this sad time. A true great of Welsh rugby."
Former Wales and Lions wing Shane Williams tweeted: "So sorry to hear that JJ Williams has passed away! It was a pleasure to have shared your jersey."
After his playing days, Williams ran his own commercial and industrial painting company and was a forthright and respected rugby commentator and pundit for BBC Wales.
He was inducted into the Welsh Sports Hall of Fame and awarded an MBE in 2012 for his services to rugby and to charity.
Williams is survived by his wife Jane and three children, Rhys - a former 400 metres hurdles European champion and Commonwealth Games medallist - James and Kathryn.