The tragic last days of Grammy-award-winning Irish singer Sinead O'Connor, who sadly passed away in July last year, have been revealed.The cause of her death has now been confirmed by a coroner as natural causes. Sinead, famous for her hit song Nothing Compares 2 U and her iconic shaved head, was found unresponsive at her home in Herne Hill, south-east London. At the time, the Metropolitan Police said her death wasn't being treated as suspicious.