This article discusses the phenomenon of "media trials" in the United States and reports a test of a typology of these trials. Media trials are defined as regional or national news "events" in which the criminal justice system is co-opted by the media as a source of high drama and entertainment. They involve cases with characteristics similar to criminal cases portrayed in the entertainment mass media -- human interest laced with mystery, sex, bizarre circumstances, and famous or powerful people. This article argues that media trials center on three themes -- "abuse of power and trust," "sinful rich," and "evil strangers" -- and that media trials have a significant social importance and impact. 26 notes, 3 tables, appendix, 45 references. (Author abstract)