PRINCE Charles is the person Princess Diana claimed in a letter wanted to kill her, the Mirror sensationally reveals today. Before she died in a car crash, Diana wrote: "My husband is planning 'an accident' in my car, brake failure and serious head injury...to make the path clear for him to marry." She gave the note to butler Paul Burrell who revealed its existence in the Mirror last year. Charles's name was blanked out. Burrell has been asked to hand the document to the coroner who today opens the inquest into Diana's death. Burrell said: "It has fulfilled its purpose....