Willard Miller and Jeremy Goodale are accused of killing Nohema Graber in Fairfield earlier this month.
In the arraignment documents filed Monday, Miller and Goodale also waived their right to a speedy trial, which means prosecutors are not required to try them within 90 days of formal charges being filed Nov. 12.
The 16-year-olds are awaiting a judge's decision on whether their $1 million bond will be reduced to give them a chance for release before trial.
Pretrial conferences for the suspects are scheduled for March 21 with trials scheduled for April 19, 2022 in Jefferson County.
WATCH: One day before her birthday, Fairfield community holds vigil for Nohema Graber