Serial killer
From Tardis Wiki, the free Doctor Who reference
A serial killer was a person who killed several people over a period of time.
Suzi Costello used the life knife to kill three victims. (TV: Everything Changes) After her resurrection, she also murdered her father and several others. (TV: They Keep Killing Suzie)
Clarence DeMarco killed fourteen women in Victorian era London. He was sentenced to death, but was saved at the intervention of Madame Vastra in exchange for the information he had on the Doctor. (TV: The Name of the Doctor)
Jack the Ripper was an infamous serial killer who was active in 1888 London. (COMIC: Ripper's Curse)
