The cause of death of Philadelphia school teacher Ellen Greenberg, who was found brutally stabbed in 2011, will be reinvestigated after a pathologist who previously ruled her death a suicide reversed course last week.

Greenberg, 27, was found dead by her fiancé, who returned to their home in Philadelphia to find the door’s swing bar lock in use. After forcing his way in, her fiancé, Sam Goldberg, discovered Greenberg dead with a 10-inch knife in her chest.