Cal Robertson

Cal Robertson is an American actor. His most notable performance was that of teenage murderer Cal Gabriel in Zero Day, a film based on the Columbine High School massacre and perpetrators Eric Harris and Dylan Klebold. Robertson was cast in the role of Gabriel when director Ben Coccio scouted for actors in Connecticut. Robertson and costar Andre Keuck shared Best Actor honors at the 2003 Slamdunk Film Festival.

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Source: Wikipedia