Philadelphia’s top pathologist ruled that a school teacher found with a kitchen knife in her chest died by suicide, the latest conclusion in a case that has seen officials repeatedly reverse their findings on the 2011 death of Ellen Greenberg. In a 32-page report completed last week, Chief Medical Examiner Lindsay Simon wrote that while the distribution of Greenberg’s injuries — she was found with more than 20 stab wounds and cuts to her neck, head and torso — were “admittedly unusual, the fact