Dragnet was created and produced by Jack Webb who starred as the terse Sgt. Friday. Webb had starred in a few mostly short-lived radio programs, but Dragnet would make him one of the major media personalities of his era. Dragnet had its origins in Webbâs small role as a police forensic scientist in the 1948 film, He Walked by Night inspired by the actual murder of an LAPD officer. The film was depicted in quasi-documentary style, and Marty Wynn (an LAPD sergeant) was a technical advisor on the film. Webb and Wynn became friends, and both thought that the day-to-day activities of police officers could be realistically depicted, and could make for compelling drama without the forced sense of melodrama then so common in radio programming (and very common on movies and television today).