article_snippet: The artist - who had just moved to West Sussex from Scotland - had gone to bed at 10pm on December 29, 2013.
article_snippet: Twelve hours later, on December 30, 2013, her sister found her sister dead in a ground floor bedroom at the rear of the house.
article_snippet: A post-mortem examination revealed the grandmother had suffered significant head and facial injuries at the house.
article_snippet: Despite extensive investigations by police, her sister still remains at large.
highlights_snippet: Artist, 55, went to bed at 10pm and Valerie Graves sister found her sister body 12 hours later .
  
highlights_snippet: Postmortem exam revealed her sister suffered significant head and facial injuries .
  