ABSTRACT
The National Confidential Inquiry into Suicide and Homicide by People with Mental Illness (NCISH, the Inquiry) is a unique United Kingdom-wide research project that collects detailed data on all homicide offenders who have been convicted of murder, manslaughter, or infanticide; those who were unfit to plead; or those who had been found not guilty by reason of insanity. While the focus is on perpetrators who have been in contact with psychiatric services in the 12 months prior to the index offense, the Inquiry collects information on all homicide perpetrators in the United Kingdom. This has created one of the most comprehensive homicide databases in the world.
