Lucy, one of the best known ancestors of humans to ever roam the earth, may have died after a fall from a tree, University of Texas researchers said on Monday after studying her 3.18-million-year-old fossilized remains.

A high resolution X-ray CT scan of Lucy, a female hominid, indicates she suffered fractures to her right upper arm not typically seen in fossils. There were also less severe fractures on the left shoulder and other compressive fractures throughout the skeleton, they said.

The injuries were consistent with those "caused by a fall from considerable height when the conscious victim stretched out an arm in an attempt to break the fall," according to John Kappelman, a University of Texas anthropology and geological sciences professor, who consulted with Stephen Pearce, an orthopedic surgeon at the Austin Bone and Joint Clinic.