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Towards the end of The Woman in Black (2012), Arthur Kipps finds the dead body of the child in the marshes, and he places his dead body into his grave. I thought the grave should have been empty, but there was another corpse (in skeleton form) in that grave. Whose corpse is that?

Towards the end of The Woman in Black (2012), Arthur Kipps finds the dead body of the child in the marshes, and he places his dead body into his grave. 

I thought the grave should have been empty, but there was another corpse (in skeleton form) in that grave. Whose corpse is that?