But Diana did not die completely, converting herself into a demonic, malevolent creature that can exist only in the darkness. Doctors began performing experiments on Diana but finally killed her by overexposing her to light. It is revealed that she was a woman in a mental hospital that had Xeroderma pigmentosum, a serious skin condition that prevented her from being in any light.
In the 2016 film Lights Out, Diana is a mysterious figure that attacks people only in the dark.
