Slender Man stabbing: Chilling interrogation video of suspects released

The nine-hour police interrogation of the two suspects in last year's brutal Slender Man stabbing has been released.

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ABC affiliate WISN obtained the police interrogation video of the two teenage girls who were charged with stabbing their friend 19 times to appease the fictional horror character known as "Slender Man."

One of the girls in the video said to police that they told their friend they were going bird watching.

"People who trust you become very gullible . . . it was sort of sad," one of the girls told police in the video obtained by WISN. The video continues to show one wiping away her tears as she explained how killing their friend would appease Slender Man.

"We told her we were going to get help . . . but we weren't. We were going to run and let her pass away. So we ran," one of the suspects told police in the video. According to WISN, one of the suspect's interrogations lasted almost six hours, some of that time the suspect spent eerily singing.

"We knew it was going to be at my birthday sleepover," one of the suspects told police. "You have no idea how difficult it was not to tell anyone. I knew we'd get in trouble."

One of the suspects told police that it didn't feel anything as she stabbed the victim.

"I didn't know what I did . . . it sort of just happened. I didn't feel like anything. It was like air," one of the suspects told police.

One of the girls told police that she saw Slender Man after the stabbing was completed. Both of the girls face charges of attempted intentional homicide, and their attorneys have argued their case should be moved to juvenile court, according to WISN. A judge is expected to rule on March 13 whether a trial will move forward in adult court.

ABC News' David Muir will be reporting on the new developments in the Slender Man case in a 20/20 special on Friday, February 20 10 PM ET / 9 PM CT on ABC.
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