The attorney for Slender Man defendant Morgan Geyser says his client's confession shouldn't have been admissible at her trial.
Geyser and another girl stabbed a classmate 19 times and left her for dead. They said they did it to impress the internet character Slender Man. Now, Geyser's attorney says she didn't know what she was doing when she waived her rights before admitting the crime. She is serving a 40-year sentence in a state mental health facility.