Using data from the Federal Bureau of Investigation's Uniform Crime Reports and the Supplementary Homicide Reports, the study examined 514 single victim cases between 1993 and 1995. Siblicide was more common in early to middle adulthood as opposed to adolescence. There was a stable trend in the frequency of siblicide at approximately 1.0 percent of the national homicide rate over a 12-year period. Specific variables addressed included age, gender, type of weapon, race/ethnicity, offender-victim relationship and the geographical distribution of siblicide cases. The article suggests the need for future research in the areas of sibling bonding, sibling rivalry and sibling abuse to construct a comprehensive model for prevention and intervention. A true understanding of sibling homicide will likely require a multisystemic and multitheoretical integration. Tables, references