A post mortem examination on British singer Amy Winehouse failed to determine how she died and more toxicology tests are being carried out, with the results expected in two to four weeks, police said on Monday.
Her father Mitch flew in from New York to visit a growing shrine outside the house. Surrounded by television crews and well-wishers, he read the dozens of condolence messages and walked along banks of teddy bears, flowers -- and the occasional bottle of vodka -- left by fans of the troubled singer.
The beehive-haired soul singer won critical acclaim after the release of her debut album "Frank" in 2003 before becoming a worldwide phenomenon with the success of "Back to Black."
Winehouse's death has sparked a surge in demand for her music. British music retailer HMV predicted on Monday that she would be number one next week as sales of "Back to Black," which won five Grammys, continue to grow.