The attorney for a 16-year-old girl charged in a high school restroom assault that left another girl dead says his client has maintained good grades and had no prior disciplinary history involving fighting or other disruptive behavior.

Attorney John Deckers also told The Associated Press in a statement Tuesday that his client had no way of knowing that the April 21 altercation at Wilmington's Howard High School of Technology would result in the death of 16-year-old Amy Joyner-Francis.

Deckers' client is charged with criminally negligent homicide. Prosecutors have said they will seek to have her tried as an adult.

Two other 16-year-old girls are charged with misdemeanor conspiracy.

Authorities said Joyner-Francis died of sudden cardiac death, with a contributing factor of physical and emotional stress due to physical assault.