text: Agatha Mary Clarissa , Lady Mallowan , DBE ( 15 September 1890 - 12 January 1976 ) , commonly known as Agatha Christie , was an English crime fiction writer .
  
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  Agatha Christie , formally known as Agatha Mary Clarissa , Lady Mallowan of the Order of the British Empire died in the year 1976 to a common flu .