We report a population-based quantitative genetic study examining the aetiological links between psychotic disorders and violent crime using a sample of ~1.8 million Swedish individuals born between 1958 and 1989. Consistent with previous population-based research,11, 12, 13 we found substantial heritability estimates for schizophrenia, bipolar disorder, substance misuse and violent crime (h2=53–71%). Schizophrenia was a stronger predictor of violent crime (r=0.32) than bipolar disorder (r=0.23).