Analysis revealed that foreign-born persons were overrepresented in the homicides of California residents. Further analysis focused on homicide data for the 38,774 victims who were ages 15-34 years and who accounted for a majority of all homicide victims. Immigrant-to-nonimmigrant risk patterns differed by ethnicity and across time. During the 23-year study period, foreign-born white persons, Hispanic persons, and Asian persons and others were at significantly higher risk and foreign-born black persons were at a statistically similar risk of homicide compared with their counterparts born in the United States. The risk ratios were 2.12, 1.24, 1.72, and 0.60, respectively. Figures, table, and 14 references (Author abstract modified)