Ten-year-old Elisabeth Leakes was waiting in line at Mountain Park Elementary School in February 2002 when Chad Brant Hagaman came up behind her and hit her in the back of the head with a hammer, police said.
The head of the hammer was imbedded in the girl's skull and she underwent emergency brain surgery. The girl recovered from the attack, but her family said she still suffers memory problems.
Hagaman, of Lilburn, is charged with aggravated battery, cruelty to children and carrying weapons on school property.
Hagaman was expected to plead guilty in court Friday. The Gwinnett County District Attorney's office hasn't released details of the plea deal.
The girl's parents have filed a lawsuit against the Gwinnett County school system and staff members at the elementary school. The suit claims security at the school was inadequate to protect their daughter. It seeks unspecified damages