Millwall FC owner John Berylson has died in an accident at the age of 70, the Championship club have announced.
American businessman Berylson first became involved in the south east London club in 2006, and was an immensely popular figure with Lions supporters.
The club said: "It is with a collective broken heart and the deepest of regret that we announce the passing of our beloved owner and chairman, John Berylson.
"John, who turned 70 last month, lost his life in a tragic accident on Tuesday morning, and the thoughts of everyone at the club are with his wife Amy, his three children Jennifer, James and Elizabeth, and the rest of the Berylson family.
“John’s sudden and tragic passing will unquestionably impact all those who were fortunate to have know him. He was truly a great man, incredibly devoted to his family and a person of such remarkable generosity, warmth and kindness.
“He lived a storied life, one full of colour and joy, and was infinitely thoughtful of others with an endless desire to share his immense knowledge and experience to help people.”
Millwall were promoted from League One under Berylson's stewardship in 2010 and 2017, and the owner lifted the playoff trophy on the pitch at Wembley six years ago.
Ever since that promotion they have remained competitive in the Championship, and came close to reaching a playoff place last season, only missing out on the final day of the campaign.
A book of condolence is being opened at the club's stadium, The Den, from 11am on Wednesday morning.
The club said: "Under John’s passionate leadership and guidance, Millwall Football Club has enjoyed tremendous success and stability.
"Since first becoming involved in the club in 2006, he has presided over some of the greatest moments in Millwall’s history, and his influence in providing the platform for those was immeasurable. John continued to speak eagerly about the new season and his vision for the future, and any success moving forward will be in his memory and honour. It will be his legacy.
"John revelled in the club’s underdog status and mentality. He related strongly to such values and identity and adored Millwall supporters. He was fiercely loyal to all his staff, and both they and the fan base will miss him beyond measure.
"Rest in peace, John, and thank you. You were loved and adored."