Homicide-Suicide (H-S) is a rare but violent event in which an individual commits homicide and thereafter commits suicide. The H-S phenomenon appears to be increasing among members of the South African Police Service (SAPS). Although research on H-S is sparse, several SA studies have implicated the SAPS as a high risk occupational group for such killings. However, no systematic research that focuses on police H-S has ever been conducted within the RSA. The aim of this thesis is to determine the underlying causes of police H-S killings. The current national study included thirty-eight (38) police H-S cases over a two-year period (2012-2013). The macro, meso, and micro levels of analysis were utilised to study this phenomenon and to test both the socio-cultural and intrapsychic explanations of H-S. A mixed method approach was utilised, which involved both qualitative and quantitative methodologies. Information on H-S was collected via document analysis and interviews with survivors of an H-S attack. The data obtained from the documents were coded on the SAPS “Homicide-Suicide Incidence Coding Form” and the results of this analysis were presented graphically in both tables and charts. Three interviews were conducted with the survivors of these attacks and were qualitatively analysed. The SAPS displayed an H-S incidence rate of 24.27 per 100 000 police officers. A typical police H-S perpetrator is likely to be a black African male who is 35 years old with a Grade 12 education. He would hold the rank of a constable and would have a history of domestic abuse. His victim would usually be an intimate partner of the same race who would be younger than him. She would be employed as an administrative clerk and would be shotand killed multiple times by her amorous jealous boyfriend due to a heated argument or quarrel. The service pistol would be used to commit both H-S killings. Four main themes emerged from the transcripts, namely: Patriarchal dynamics in H-S relationships, Financial issues and the patriarchal order, The death wish (“Thanatos”) of the perpetrator and the H-S survivors as double victims. On the macro level, partial support was found for social integration theory, while the meso and micro levels of analysis supported the psychodynamic perspective. / Psychology / D. Litt. et Phil. (Psychology)