Les McKeown from the Bay City Rollers had died aged 65.
His family announced his death on the band's Facebook page, saying that the singer had died suddenly at home on Tuesday.
A message from his family on the page said: "It is with profound sadness that we announce the death of our beloved husband and father Leslie Richard McKeown. Leslie died suddenly at home on Tuesday 20 April 2021.
"We are currently making arrangements for his funeral. If you would like to remember Leslie, please make a donation in his name to: [details] We thank you and ask for privacy after the shock of our profound loss. Thank you. Keiko and Jubei McKeown."
Below the sad post fans rushed to share their condolences following the loss of the Scottish native who was the lead singer of the 70s boyband - reports Mirror Online.
One heartbroken music lover typed: "No words - this is so sad. Many thanks for the music and memories and much love and deepest condolences to Keiko and Jubei. RIP."
A second echoed: "so sad, rip and thank you for the music, you made my teenage years special."
Another said: "So shocked to be reading this. Les was my childhood hero and have been so excited to have seen him so many times over the last few years. RIP Les thoughts are with his family at this very sad time xxx"
And a fourth said: "So very sad to hear this news. He was the music of my generation. I've been blessed to see him perform 3 times in recent years. Condolences to his family."
Les found worldwide fame in the Bay City Rollers and became used to being mobbed by crowds of shrieking teenage fans in the 70s.
The band hit the big time in 1973 with Remember before releasing hit after hit including All of Me Loves All of You, and I Only Want to Be With You.
