Demographic and psychological test data were obtained for each subject. There was significant psychopathology found across groups, more suggestive of major mental illness than of psychopathy. When data on the heinousness of each individual crime were examined, NGRI subjects were found to commit the least heinous offenses, and those on death row were found to commit the most heinous. Directions for future research and the operation of the legal system in general are discussed. (Publisher abstract)