Ask those you love and trust for support. You don't have to face this alone. Write about your loss. Journaling will bring your unexpressed emotions to the surface, thereby encouraging the grieving process to move along. Create your own ritual.
Most cultures have ceremonies to mark death.
A ritual marking any loss helps us to acknowledge that the loss is real. It is a way to honor the loss, and to separate the past from the present. When faced with any kind of a loss, feel free to create any kind of ceremony that holds meaning for you. When a painful loss first occurs it is impossible to imagine that anything good could come from it. With time and perspective, however, you may be able to see something positive.