London police were reportedly called to Amy's apartment today, where the 27-year old singer was found dead.  

A press release from the Metropolitan Police says that inquiries continue into the circumstances, and that at this point it's being treated as unexplained - although some people are already reporting a drug overdose was to blame.  Amy fought a well-publicized battle with her addictions over the years, and very recently cancelled her European tour following an appearance where she was visibly under the influence.