Richie Roberts is the police officer who brings down Frank Lucas in American Gangster. He's a former Marine and New Jersey Police Detective for Essex County and eventually became an Essex County Assistant Prosecutor, heading the Bureau of Narcotics after passing the New Jersey Bar Examination.
Detective Richie Roberts: My investigation indicates that Frank Lucas is above the Mafia. District Attorney: Who does he work for? Which family? Detective Richie Roberts: He's not Italian, he's black. District Attorney: No black man has accomplished what the American Mafia hasn't in a hundred years!