“…So far as this review can discover, the first published work using methods of numerical taxonomy on data collected after death by suicide was a study conducted in Brighton, UK [10,11] using coroner's data files. In this study, suicidal deaths fell into three groups: (a) younger males with disrupted childhoods, leading sociopathic, criminal, drug-addicted, and marginalized lives, with several prior suicide attempts; (b) middle-aged males, many of whom expressed suicidal ideation, and only atypically had made an attempt-but who could not abide further episodes of acute depression and schizophrenia; and (c) elderly people of both sexes, with no history of previous attempts, currently plagued by infirmity, depression, pain, and poor sleep.…”