The teens are accused of assaulting 16-year-old Aquilee Muse during a May 9 fight. Aquilee suffered a severe head injury after falling and hitting his head on concrete. He died May 13 after he was taken off of life support.
The two other 16 year olds charged in the fight have pleaded no contest to amended juvenile charges. One pleaded guilty to manslaughter, the other to accessory to assault.
The Associated Press generally does not name minors accused of crimes.
Prosecutors say video recordings of the fight show Muse throwing the first punch.