It is widely accepted that the execution of mentally ill individuals is unacceptable and a clear violation of international standards. Both international and domestic law in many countries around the world prohibit the execution of people with mental illness.
There is little data on exactly how many people suffering from severe mental health problems are facing the death penalty, but there are examples all over the world of such cases, including many that Reprieve has worked on in the US, China, Pakistan, and Malawi.