Amy Winehouse autopsy expected today

British singer Amy Winehouse poses for photographs after being interviewed by The Associated Press
Amy Winehouse poses for photographs after being interviewed by The Associated Press at a studio in north London on Feb. 16, 2007. AP

(CBS/AP) LONDON - A post-mortem examination is scheduled to take place Monday to determine the cause of singer Amy Winehouse's death.

Police said a post-mortem would be conducted Monday afternoon, when an inquest into the death will be opened and adjourned. Results will likely be announced Tuesday.

Pictures: Amy Winehouse, 1983-2011
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Pictures: The death of Amy Winehouse

The 27-year-old singer died Saturday after publicly struggling with drug and alcohol abuse for years. Her body was discovered at home by a member of her security team, who called an ambulance. It arrived too late to save her.

Police have said the cause of her death is being treated as "unexplained," and have said speculation that she might have suffered an overdose was inappropriate.

British tabloid The Sun reports that Winehouse may have been dead for up to six hours before she was discovered lying in her bed, around 4 p.m. London time. The Grammy winner last spoke to her security team around 10 a.m. on Saturday.

Police sources said there was no sign of drugs in the house, according to the paper.

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Sources also told The Sun that Winehouse had seen a doctor on Friday night as part of a series of regular check-ups, and the doctor saw nothing amiss.

Fans have gathered outside the singer's London home to pay tribute and leave flowers and memorabilia dedicated to her.

On Monday, Winehouse's parents stopped by the vigil site to thank the mourners for their support.

The singer's mother, Janis, was in tears as she examined the flowers, candles, vodka bottles, flags, drawings and handwritten cards left by neighbors, fans and well-wishers.

Mitch Winehouse thanked people for coming to lay bouquets, candles and handwritten notes, which lay in growing mounds across the road from where his daughter died.

"I can't tell you what this means to us - it really is making this a lot easier for us," he said. "We're devastated and I'm speechless but thanks for coming."