Amy Winehouse's "unexplained" death will remain unexplained for weeks after an autopsy on Monday afternoon did not reveal the cause of her death. London's Metropolitan Police say that further toxicology tests should reveal more about what happened to the singer on Friday night, and the results will take two to four weeks. Those close to Winehouse believe that a mix of drugs and alcohol led to a deadly overdose, although a police report found no drugs in her home.

Monday morning, Winehouse's parents visited their daughter's house on Camden Square in London which fans had turned into a shrine of sorts. Candles, flowers, notes, flags and vodka bottles filled the sidewalk in front of Winehouse's home. "I can't tell you what this means to us--it really is making this a lot easier for us," said her father, Mitch Winehouse. "We're devastated and I'm speechless, but thanks for coming."

Despite the delay in an explanation of Winehouse's death, a memorial service could be held as early as Tuesday.