The police said the reason for the 27-year-old singer's death is still "unexplained" and are now treating her flat as a crime scene.

Sky News quoted a source saying Winehouse might die from a suspected drugs overdose.

The singer had died before the paramedics arrived, said London Ambulance Services.

Winehouse became an international star in 2007 with her five Grammys-winning album "Back to Black," which combined jazz, soul, rock and classic pop.

Her health appeared fragile as she was taken to hospital and treated for injuries after fainting and falling at home once in 2008 and again in 2010.