It should be allowed to take its course. Loss must be faced head-on. Viewing the body of a loved one helps us accept the loss. As difficult as that is, it keeps us from denying the fact of our loss. It becomes a painful starting point for us, even in our grief, to begin rebuilding our shattered world.
Denial is the opposite of accepting the loss.
It is the refusal to believe that a loss has been suffered. Some parents deny by keeping the child's room as it was when he or she died. A wife leaves her husband's clothes hanging in the closet and his toothbrush on the sink. These behaviors are not unusual. But they become denial if they persist for several years.