Authorities in Idaho reported that they found Ernesto A. Bustamante, who until last week was an assistant professor of psychology at the University of Idaho, dead from an apparently self-inflicted wound. The Associated Press reported that he was the primary suspect in the murder of a graduate student in psychology. Officials did not say why Bustamante left the university or whether he knew the victim, Katy Benoit, who earned her undergraduate degree at Idaho last year.