A 53-year-old award-winning radio presenter and music composer for BBC died of a heart attack after taking an illegal party drug called "Meow Meow", a media report said.
George Webley was found struggling for breath at his home by his wife. He suffered a massive heart attack and was pronounced dead when paramedics arrived, the Daily Mail reported.
Webley had a history of heart trouble but the autopsy report revealed the death was caused by the banned drug.
The drug was outlawed in April 2010 after it was linked with a series of deaths.
Webley was a guitarist and pianist as a teenager who played in bands before moving to the London recording scene.
He also worked on advertising jingles.
In the 1990s, he became a leading composer of television theme tunes.
Webley began a radio career in the mid-1990s and in 2002 won a gold Sony Award for best music presenter for his show on BBC Three Counties Radio, which covers Bedfordshire, Hertfordshire and Buckinghamshire.
In 2006, he moved to BBC London 94.9 and hosted a popular late night show.