Calvin Kenneth " Cal " Robertson ( born June 10 , 1986 ) is an American actor and cinematographer . 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 co-star Andre Keuck shared Best Actor honors at the 2003 Slamdunk Film Festival . Robertson also had many roles in television series including '' The Sopranos '' to '' White Collar ''
Columbine High School massacre
Columbine High School massacre
Cal Robertson