The autopsy of Amy Winehouse is inconclusive and provided no closure to friends and fans who wanted to know the cause of her death.

UK authorities stated that the autopsy "did not establish a formal cause of death and we await the results of further toxicology tests." The further toxicology reports take two to four weeks, according to AP.

So far, her death "was investigated by police and determined non-suspicious," according to the coroner's office.

Upon the death of Amy Winehouse, her autopsy and cause of death were not the primary concern of her friends and fans. Instead, most poured out their condolences and sadness over a life lost at the young age of 27.

"i cant even breath right my now im crying so hard i just lost 1 of my best friends. i love you forever Amy & will never forget the real you!" tweeted her friend Kelly Osbourne.

"Dear God have mercy!!! I am SICK about this right now! #DearAmy," tweeted Rihanna, another young and talented singer.

"Truly sad news about Amy Winehouse. My heart goes out to her family. May her troubled soul find peace," tweeted Demi Moore.

Still, Winehouse was a highly controversial figure due to her public struggles with drugs and alcohol abuse. The biggest question surrounding her death, therefore, is if she died from substance abuse.

Initial reports, mostly from UK paper The Mirror, indicated that drugs and alcohol indeed played a role.

The paper, citing her friends, said her death was preceded by a "binge on ecstasy and booze."

"She has spent the last seven days on a massive bender and people were saying she's going to drink herself to death," another friend told The Mirror.

However, People.com reported that there was no sign of drugs at Winehouse's apartment, citing police sources.

Instead, she may have died alone in her bed for as long as six hours for unknown reasons before she was discovered, reported People.com.

Regardless of how she died, Winehouse will likely primarily be remembered for her music rather than her substance abuse.

Already a highly-successful award-winning artist, the sale of her music surged after her death. Her album "Back to Black" currently tops iTunes and occupies the second spot on Amazon.com MP3 downloads.

United kingdom Amy Winehouse