 Dr. Judith Becker, a professor of psychiatry and psychology, was the second expert witness for the defense; Becker also diagnosed Dahmer with necrophilia.The final defense expert to testify, forensic psychiatrist Dr. Carl Wahlstrom, diagnosed Dahmer with necrophilia, borderline personality disorder, schizotypal personality disorder, alcohol dependence, and a psychotic disorder.The prosecution rejected the defense's argument that Dahmer was insane.