On January 26th, 2011, Ellen Greenberg left work because Philadelphia was getting hit with a blizzard.  She got back to her apartment where she lived with her fiancé Sam Goldberg and she was later pronounced dead that evening.  She had 20 stab wounds, and her death was ruled a homicide, but the manner of death was reversed and officially ruled a suicide in February of 2011.
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Resources:

• Me-Inv-RPT.pdf (documentcloud.org) 
• The Vidocq Society: Serving law enforcement since 1990 
• Suicide Or Murder: What Happened to Ellen Greenberg? | Crime News (oxygen.com) 
• Ellen Greenberg died by ‘suicide’ with 20 stab wounds. Her parents are out to prove that’s impossible (msn.com) 
• Parents’ $500K investigation of Pa. woman’s ‘suicide’ uncovers clues they say point to murder - pennlive.com 
• Modern analysis of 2011 death finds Pa. teacher’s 20 stab wounds were likely from ‘assailant’ - pennlive.com 
• Petition · Justice for Ellen Rae Greenberg · Change.org 
• Parents of Ellen Greenberg believe new evidence submitted to the Philadelphia Attorney General's Office will prove their daughter's 2011 death was murder, not suicide (nbcnews.com) 
• Friend of woman whose 'suicide' is now being reevaluated missed a call from her before she died | Daily Mail Online 
• The Prosecutors Podcast – Two prosecutors take on the toughest cold cases. 
• Fundraiser by Friends of Greenberg Family : Justice for Ellen (gofundme.com) 
• (1) The Murder of Ellen Greenberg | Part 3 | The 911 Call - YouTube 
• Ellen Greenberg - Case Documents and Details - Gavin Fish 
• Big Mad True Crime: Murder or Suicide? - The Mysterious Death of Ellen Greenberg on Apple Podcasts