Ellen — Hannah Beier

he had 20 knife wounds and at least 11 bruises. Authorities said she killed herself

Ellen Greenberg, a 27-year-old Philadelphia teacher, was found dead in January of 2011 in the apartment she shared with her fiancé. She had 20 knife wounds and at least 11 bruises.Her death was first ruled a homicide - but after meeting with law enforcement officials, the medical examiner changed her cause of death to a suicide. Authorities concluded she died alone in a locked apartment. But that finding has astonished Ellen’s parents, her friends, and more than 163,000 people who have signed a petition demanding justice in the case.

The Greenbergs have hired forensic pathologists to analyze the scene photos and the autopsy, and a crime-scene expert to interpret the bloodstains. “I want justice for Ellen. I want to see that before I die” said Josh Greenberg, Ellen’s father. This story is about secrets, and alleged cover-ups, and how well we know the people we think we know. It’s based on interviews with two dozen people and thousands of pages of official records, some of which have not been previously disclosed.

This story, written by Thomas Lake, is published in CNN.

Dr. Wayne Ross poses for a photo in Chester Springs, Pennsylvania.

Land near Dr. Wayne Ross's office is pictured in Chester Springs, Pennsylvania.

Ellen Greenberg and Samuel Goldberg are pictured in a photo in Plymouth Meeting, Pennsylvania.

Dr. Wayne Ross poses while holding a photo of Ellen Greenberg from her autopsy in Chester Springs, Pennsylvania.

Dr. Wayne Ross poses for a photo with his microscope in Chester Springs, Pennsylvania.

A slide of a thyroid glad is pictured through Dr. Wayne Ross's microscope in Chester Springs, Pennsylvania.

Debbie Schwab looks at a photo of Samuel Goldberg and Ellen Greenberg while posing for a photo in Plymouth Meeting, Pennsylvania.

A note that Ellen Greenberg wrote to Debbie Schwab's daughter is pictured in Plymouth Meeting, Pennsylvania.

Trees are reflected in the Schuylkill River in Philadelphia, Pennsylvania.

Guy D’Andrea poses for a photo in Philadelphia, Pennsylvania.

A slide of a thyroid glad is pictured under Dr. Wayne Ross's microscope in Chester Springs, Pennsylvania.

Guy D’Andrea poses for a photo in Philadelphia, Pennsylvania.

Light is pictured across from 5th Police District in Philadelphia, Pennsylvania.

A police car is parked outside of the 5th Police District in Philadelphia, Pennsylvania.

Apex Manayunk is reflected in the Manayunk Canal in Philadelphia, Pennsylvania.

A Sunoco gas station is pictured in Philadelphia, Pennsylvania.