What happened to John Kelly?

Malcolm Brown has been used as the backup, but did something happen to John Kelly? Did I miss something?

will be something. at some point.

Someone correct me if I am wrong, but Malcolm Brown also contributes on special teams I believe, so they figured they were killing two birds with one stone having Brown as the backup rb to create another open roster spot. If anything happened to Gurley, Kelly would come in to take on a running back role. Brown is a special teamer who happens to also play running back when needed.