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One hundred four men who committed suicide during an episode of major depressive disorder were compared to a group of 74 living men with major depressive disorder. Both groups were similar in terms of age, marital and parental status, education level, race, and religion. To our knowledge, this is the first study that has used a design that allowed direct control for the effect of major depressive disorder during an investigation of risk factors for suicide. In addition, there are only a few studies of suicide completers (31–33) that investigated impulsive and aggressive behaviors using a case-control design and standardized interviews to retrieve information on personality disorders and personality traits of the deceased.