Why are we so obsessed with serial killers? Why is it that these murderers always catch the attention of the public? Perhaps, it's because they all seem to have an interest in talking about their crimes? Many famous serial killers and murderers sent some disturbing letters to their families, victims, and "fans," both from prison and before their arrests. These chilling letters from killers will have you checking over your shoulder, and maybe a little wary of opening the mail.

Famous unknown killers like the Zodiac Killer and Jack the Ripper taunted the police during their crime sprees; murderers like John Wayne Gacy received prison fan mail from people who wanted to know what made him tick, and he crafted some unsettling responses.

This list features photos and scans of serial killer letters and some creepy and bone chilling excerpts.