Are there any other serial kilers in the modern world like who never got caught?The Zodiac killer is known for sending letters with cryptograms to authorities and marking his work with a cross - hatchet sign. They have a sketch of him yet authorities can't find him. Most of his murders were in the late 1960's through 70's. He hasn't killled anyone lately though and may have died by old age now.
Here's the sketch
Here's a wikipedia page about him if you want to learn more. http://en.wikipedia.org/wiki/Zodiac_Killer#Confirmed_victims