The Canadian data confirm the general findings of American studies that most homicide involves single offenders and victims, but some differences emerge between the American and Canadian juvenile homicide. When strangers were victims in Canada, a single offender was involved 67 percent of the time; the similar figure for the United States was 31 percent. For every category of social relationship, there was substantially more multiple offender perpetration in the United States than in Canada. Of the homicides committed by youth in Canada, 14 percent involved a parent as the victim and 19.5 percent involved other family members, 35 percent were acquaintances, and strangers accounted for approximately 31.5 percent. Children who committed homicide in the United States tended to focus less on family members and more on acquaintances than their Canadian counterparts. 7 notes, 1 figure, 8 tables, and 27 references (Author abstract modified)