A grand jury in Miami-Dade County yesterday indicted the teen, Marc Wabafiyebazu, on first-degree murder charges. He was to be transferred from a juvenile detention center to a jail pending trial, court sources said.
Wabafiyebazu -- whose mother is diplomat Roxanne Dube -- will be tried as an adult.
His attorney, Curt Obront, told AFP: "We will be entering a plea of not guilty to the charges."
Police say the teen and his 17-year-old brother Jean drove their mother's car, which had diplomatic license plates, to a house in Miami, where they allegedly planned to steal a kilo of marijuana from drug dealers.
Dube, a veteran diplomat, was named Canada's consul general in Miami in November and her sons joined her in February.