The case surrounding a stabbing that became known nationwide as the "Slender Man stabbing" more than a decade ago took a new twist over the weekend.

One of the attackers who repeatedly stabbed and nearly killed her sixth-grade classmate, cut off her ankle monitor and escaped from the group home she was in in Madison, Wisconsin, leading to an hours-long search that Sunday night when police discovered her sleeping outside an Illinois truck stop.

But who is Slender Man and what led up to the surprising new developments in the case?

Here's what to know:

What or who is 'Slender Man'?

Slender Man was created online by Eric Knudson in 2009 as a mysterious figure photo-edited into everyday images of children at play. He grew into a popular boogeyman, appearing in video games, online stories a

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