Joanna is the killer in the case of the caped murderer.
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The killer is the roommate of Mike Myers character's girlfriend. At first he fears his girlfriend is the killer, but at the end he finds out it's not her, but her roommate.
In the original When a Stranger Calls (1979), the killer is a child murderer who is a total stranger to Jill (the babysitter, played by Carol Kane).I don't think we ever find out who the killer is in the 2006 remake, but I doubt that it is her father (unless that's supposed to be a shocking surprise that they're saving for the sequel).
The real killer was Norman Thurston.
Donald Harding - murderer - died in 1992.
Catherine Hayes - murderer - was born in 1690.