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The man charged with murdering 18-year-old Kajetan Migdal in Stevenage appeared at St Albans Magistrates' Court. He is due at Luton Crown Court on June 1.
Patrick Sharp, also aged 18, is accused of murder, possession of cocaine, possession of a bladed article and attempted robbery after the death of Kajetan Migda in Stevenage.
Schoolboy Kajetan Migdal, who was killed in an attack in Cuttys Lane Stevenage, was a dancing star who appeared on hit-BBC TV show The Greatest Dancer.