WAUKESHA, Wisc. (ABC) -- The mental competency trial of a Wisconsin teen accused of stabbing a classmate to appease a fictional horror character called Slender Man is underway.
It's been more than three years since Anissa Weier and Morgan Geyser admitted to stabbing 6th grader Payton Leutner 19 times, leaving her for dead.
"The bad part of me wanted her to die, but the good part of me wanted her to live," said Weier.
But the why was especially shocking. The girls said they wanted to be followers of the fictional internet character Slender Man.
"To prove to Slender Man that they were worthy to be proxies, they had to kill someone close to them," said Weier's attorney, Joseph Smith.
At her trial, Anissa's defense team is arguing Anissa was mentally ill, and should be confined to a mental hospital, rather than sent to prison for the crime. At one point, Anissa wiped away tears as her attorney recounted how she came to believe Slender Man was real.
"Anissa and Morgan, two 11-year-olds, found one another and then shortly after that, Anissa lost touch with reality and fell prey to that delusion," Smith said.
But prosecutors say Aanissa was hardly a meek *follower.*
"Morgan is the one that does the stabbing, I'm not denying that, but it's on Anissa's command, go berserk, and Morgan unfortunately does. And Payton is stabbed repeatedly and it's only through the grace of God that she's alive today," said Kevin Osborne, Waukesha Co. Assistant District Attorney.
Anissa's father said he was unaware of any delusions.
"Not to the point that we saw any major concerns," said Bill Weier.
And admitted to prosecutors he never saw any signs of mental illness.
"It was my opinion that she was a normal child," he said.