The star, who launched his career with Wham! in the 1980s and had huge success as a solo performer, Pop superstar George Michael's death at the age of 53 from suspected heart failure is being treated by police as "unexplained but not suspicious".
The singer died peacefully at home, his family said on Sunday night.
"It is with great sadness that we can confirm our beloved son, brother and friend George passed away peacefully at home over the Christmas period," Michael's family said in a statement released by Thames Valley Police.
Michael, who was born Georgios Kyriacos Panayiotou in north London, sold more than 100 million albums throughout a career spanning almost four decades.
He first found fame with schoolfriend Ridgeley in duo Wham! - reaching number one in the UK singles charts on four occasions. One of the band's most enduring songs Last Christmas, is currently number 16 in the UK singles chart.
The song was originally released in 1984 and is the biggest selling single not to reach number one.
It was kept off the chart's top spot by Band Aid's Do They Know It's Christmas, which actually featured Michael.
Solo albums followed, including the multi-million selling Faith in 1987.
The follow-up Listen Without Prejudice Vol. 1 outsold Faith in the UK but led to Michael losing a court case with record label Sony over his frustration at how the album has been marketed.
His talents as a singer, songwriter and music producer made George Michael one of the world's biggest-selling artists.
Blessed with good looks and a fine singing voice, his stage presence made him a favourite on the live concert circuit as he matured from teen idol to long term stardom.
But there were times when his battle with drugs and encounters with the police made lurid headlines that threatened to eclipse his musical talents.