This article doesn't have many details but appears a good guy tried to break up a fight, his gun came out of his holster and fell to the ground. When he picked it up campus police shot and killed him. Tragic.
http://katu.com/news/local/friends-...-portland-state-officers-as-loving-father-vet
http://katu.com/news/local/friends-...-portland-state-officers-as-loving-father-vet