In the end, Sunlight tells Kinderman that the demon from the earlier novel (The Exorcist) aided him to possess the body of Damien Karras immediately after Karras's death in an act of revenge for having been driven out of the little girl. Sunlight spent many years trying to gain control of the body, which had suffered from injuries, during which time Karras was held in a mental hospital. He lacked any identification and was nicknamed Sunlight because he sat in the sun's rays as it passed through the window of his cell. Upon finally gaining control of Karras' body, the Gemini occasionally left it to possess the bodies of the patients with senile dementia, and as they were in an open ward with access to the outside world, he could use them to go out and commit murders. Thus the fingerprints of several senility patients were found at the crime scenes; their bodies carried out the murders, but the Gemini Killer was in control of them.
