( CNN ) Two girls accused of stabbing a friend to impress the fictional Internet bogeyman Slenderman have been found competent to stand trial . The decision came out of a Wisconsin courtroom Thursday , Waukesha County Circuit Court reporter Kathy Fus told CNN . Morgan Geyser and Anissa Weier have been charged with attempted murder after authorities say they stabbed their classmate 19 times in May . All three were 12 at the time . The suspects allegedly left the victim to crawl to her own rescue . She was taken to a hospital after a passing bicyclist found her . Bicyclist who found victim : 'Who did that to you ? ' According to a criminal complaint , the suspects were arrested hours after the victim was discovered . The girls were allegedly trying to please Slenderman , a horror story meme the girls had encountered on a website known as Creepypasta Wiki . One of the suspects is said to have told police that Slenderman is the site 's supposed leader , and to climb into his realm , a user must kill someone . Geyser and Weier are being charged as adults . A preliminary hearing is set for February 18. Who is Slenderman ? CNN 's Jason Hanna and Eliott C. McLaughlin contributed to this report .
Morgan Geyser and Anissa Weier are being charged as adults with attempted murder . They are accused of stabbing another girl more than a dozen times in May . A preliminary hearing is set for February 18 .