Former Stanford safety Zach Hoffpauir’s brain is being donated to Boston University.

Hoffpauir died on May 14 at the age of 26. His father Doug told the San Jose Mercury News that Josh’s brain would be given to the unit at the university that studies the effects of concussions on the brain and the effects of Chronic Traumatic Encephalopathy, more commonly known as CTE.

Hoffpauir said that he suffered multiple concussions during his Stanford career. Doug also said that he wanted to “make clear” that his son’s death was not via suicide.

From the Mercury News:

Zach Hoffpauir revealed on a podcast last fall that he had sustained “five or six” concussions during his football career and suffered from depression — to the point that he attempted suicide last year.