After revisiting the seasons of Dexter, I asked myself, "How many individuals has he killed in all 8 seasons?" According to this list he has an "impressive" kill count of 135. After seeing this I wondered if there is an even more "productive" serial killer in movie and TV history.
A serial killer as defined by Wikipedia:
A serial killer is a person who murders three or more people, usually in service of abnormal psychological gratification, with the murders taking place over more than a month and including a significant break (a "cooling off period") between them.
So, which serial killer has racked up the most kills over the course of their appearances in film and TV?
If possible please add a source that can confirms the number of killings.