If you tracked a wounded deer that far,then that tells me you were pushing him WAY too soon. Shoot then sit for an hour then track. Even if the wound is not instantly fatal he won't go far. He'll go just far enough to feel safe and lay down to bleed out. If you push him then he'll keep running until every drop of blood is gone.
We waited 45 minutes. My buddy's dad was the one who has pushed the buck out of a stand of trees in the middle of a field with the bird dogs - we were mainly quail hunting. He said we should wait an hour, but we were young and way past impatient. The buck never laid down once until he dropped, right in some heavy honeysuckle right at the edge of the swamp.