This study explored the association between body mass index & completed suicide. Data are from the National Mortality Followback Study & refer to 373 suicides & 518 deaths from motor vehicle accidents as controls. Results of a logistic regression analysis indicated that, for females, the greater the body mass index the greater the suicide risk. However, this relationship did not hold up under controls for ethnicity & other covariates of body mass index. For males, the body mass index was not significantly related to suicide risk either at the bivariate or multivariate levels of analysis. (10 refs.)