Charles E. Sellier Jr.
Little Billy witnesses his parents getting killed by Santa after being warned by his senile grandpa that Santa punishes those who are naughty. Now Billy is 18 and out of the orphanage, and he has just become Santa himself.
After seeing his parents murdered in front of him a young boy spends most of his life in an orphanage where he is abused by the mother superior. When he becomes a teenager, he gets a job as a toy store Santa. When seeing two people having sex in the store brings on flashbacks of his parents, his turmoil leads him to become a Santa serial killer.