Patients with schizophrenia, psychosis or other disorders committed a total of 870 homicides across the UK between 2004 and 2014, which was just over one in ten (11%) of all killings in that time.
But the total number of homicides carried out by patients fell over the 11 years covered by the National Confidential Inquiry into Suicide and Homicide by people with Mental Illness (NCISH). There were 87 such killings in 2004 and 94 the year after, but that had fallen to 67 in 2014 – a decline of 27% over the decade studied by researchers from Manchester University who undertook the inquiry.
However, killings by mental health patients are not falling as fast as the overall drop in homicides. The 27% fall is less than the 37% drop seen in the latter. As a result the proportion of all killings committed by such patients has risen from 9% in 2001 to the 11% seen in recent years.