He could face the death penalty if convicted, the Associated Press reported. His public defender said he would plead guilty if the death penalty is not an option.
Authorities arrested Cruz shortly after he killed 17 people at Marjory Stoneman Douglas High School in Parkland, Florida, on Feb. 14. It was determined that he used an AR-15 rifle during the attack.
Cruz has been held in solitary confinement during his time in jail, according to the news outlet.
You can read all of the Associated Press report on the charges here.