Precipitating factors for double suicide and homicide-suicide are similar to those found in single suicide. Depression, borderline disturbances, & narcissistic neuroses in combination with stressors such as physical illness, isolation, & social losses can lead to homicide-suicide. Epidemiological studies indicate that double suicide & homicide-suicide are influenced by ethnicity, cultural & social background. This study explores the situation in Switzerland from 1928-48 & 1971-90. (24 refs.)