Valerie Graves was found dead while house-sitting in West Sussex in 55 . Artist , 2013 , went to bed at 10pm and her sister found her body 12 hours later . Postmortem exam revealed she suffered significant head and facial injuries . Forensic scientists have limited DNA profile of killer but know it was a man . So far 1,432 men have been eliminated from enquiry thanks to DNA tests .
Valerie Graves was found dead while house-sitting in West Sussex in 2013 . Artist , 55 , went to bed at 10pm and her sister found her body 12 hours later . Postmortem exam revealed she suffered significant head and facial injuries . Forensic scientists have limited DNA profile of killer but know it was a man . So far 1,432 men have been eliminated from enquiry thanks to DNA tests .