Anissa Weier and Morgan Geyser, both 12-years-old, are facing attempted murder charges after luring their friend into the woods before carrying out the sacrificial attack.
When the duo were questioned by investigators they said one man was to blame.
But who is Slender Man?
Here's five things you need to know about him.
Unlike other ghoulish figures we've been known to fear throughout our childhoods and sometimes into adult life, this is one villain who didn't originate from word of mouth.
Instead, the ghostly character has been spurned through online antics.
Known as the 'Internet's Monster,' Slender Man has grown through online paranoia and some clever picture editing.
The more terrified people became of the meme, the more it cropped up on their screens.
People have even starting filming themselves reacting to his presence to post on social networks.'
The clue is in the title with this one - he's incredibly tall and slender.
Typically, he's wearing a black suit and tie while having long arms stretching from his body.
In some of the scarier images he appears to have long black tentacles that are sure to send a chill down your spine.
To top it all off, he's got a deadly pale face that stares intently in the direction of his victims.
It's no surprise that children shiver with dread at the thought of Slender Man - they're his chosen prey.
Since his inception, youngsters have lived in fear of his figure lurking in the background of their photographs because it means he's finally coming for them.
The myth stretches so far that many people hold him responsible for the whereabouts of missing children all over the globe.
Originally he was said to impale children on trees when he finally got his hands on them.
Here's the catch-22 when it comes to Slender Man.
If you fear him, he will come for you.
His motives are all about suspense and he's known to stalk his victims for months, if not years, before finally striking.
It's said that the moment to start to worry about him showing up that he'll start to be everywhere you look.
There's no safe-zone when it comes to this baddy, he'll come into your home and watch you as you sleep.
Slender Man was actually created in 2009 by a man called Eric Knudsen.
He first appeared on an online forum called Something Awful but it wasn't long before he'd swept everyone's imagination.
The original frenzy behind his identity meant that the ghoul now has his own faux history stretching back hundreds of years.
Some people even argue he can be seen on Brazilian cave paintings that date back to 9000 BC.
Anissa Weier and Morgan Geyser, both 12-years-old, are facing attempted murder charges after luring their friend into the woods before carrying out the sacrificial attack.
When the duo were questioned by investigators they said one man was to blame.
But who is Slender Man?
Here's five things you need to know about him.
Unlike other ghoulish figures we've been known to fear throughout our childhoods and sometimes into adult life, this is one villain who didn't originate from word of mouth.
Instead, the ghostly character has been spurned through online antics.
Known as the 'Internet's Monster,' Slender Man has grown through online paranoia and some clever picture editing.
The more terrified people became of the meme, the more it cropped up on their screens.
People have even starting filming themselves reacting to his presence to post on social networks.'
The clue is in the title with this one - he's incredibly tall and slender.
Typically, he's wearing a black suit and tie while having long arms stretching from his body.
In some of the scarier images he appears to have long black tentacles that are sure to send a chill down your spine.
To top it all off, he's got a deadly pale face that stares intently in the direction of his victims.
It's no surprise that children shiver with dread at the thought of Slender Man - they're his chosen prey.
Since his inception, youngsters have lived in fear of his figure lurking in the background of their photographs because it means he's finally coming for them.
The myth stretches so far that many people hold him responsible for the whereabouts of missing children all over the globe.
Originally he was said to impale children on trees when he finally got his hands on them.
Here's the catch-22 when it comes to Slender Man.
If you fear him, he will come for you.
His motives are all about suspense and he's known to stalk his victims for months, if not years, before finally striking.
It's said that the moment to start to worry about him showing up that he'll start to be everywhere you look.
There's no safe-zone when it comes to this baddy, he'll come into your home and watch you as you sleep.
Slender Man was actually created in 2009 by a man called Eric Knudsen.
He first appeared on an online forum called Something Awful but it wasn't long before he'd swept everyone's imagination.
The original frenzy behind his identity meant that the ghoul now has his own faux history stretching back hundreds of years.
Some people even argue he can be seen on Brazilian cave paintings that date back to 9000 BC.
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