Most violence is not due to mental illness or people with mental illness.  Most people with mental illness are never violent.  Nonetheless, threat management professionals need to understand how mental illness and targeted violence can and do intersect and, most importantly, how to investigate and manage cases where there is a potential intersection of violence risk and mental illness.  This presentation will provide an update on the evidence about mental illness and targeted and mass violence, explore the implications and limitations of the available scientific literature, and explore practical applications of these findings for threat management professionals.