Sarah Grossman, who took part in the May 28 protest in Columbus, had recently graduated from the Ohio State University, according to The Lantern, a campus newspaper.
The autopsy after her May 30 death in a hospital revealed she died from a tear in a coronary artery related to a pre-existing case of Ehlers-Danlos Syndrome, according to The Associated Press.
The condition affects tissues that connect various parts of the body, including organs, blood vessels and bones, according to the National Institutes of Health.
Grossman had graduated with a degree in environment and natural sciences and Spanish, The Lantern reported.
The Associated Press contributed to this story.