I think it was a little girl that he killed, but he was about 12 or 13 years old and hit the smaller/younger child in the head with a large rock, killing her.
I'm trying to look up the details and can't remember the kid's name. I want to say it's Eric something. It's not Lionel Tate. That's the black kid that killed the little girl with "pro wrestling moves." This kid was white..I think he had red hair and freckles. Anybody remember??
On tbo.com today, there's an article about at 12yo boy that beat a 17 *month* old baby to death with a baseball bat. He was babysitting her and she made too much noise while he watched tv.