Murder by relationship figure: In this figure, bar graphs and a pie chart visually represent the relationships of murder victims to their offenders. The statistics are based on the supplementary homicide data that law enforcement agencies submitted to the FBI for 13,927 murder victims who were slain in 2019. Pie chart: Of the homicides that occurred in 2019 for which supplementary homicide data were received, the relationships of the murder victims to their offenders were as follows: 1,810 victims (13.0 percent) were slain by family members; 1,372 victims (9.9 percent) were murdered by strangers; and 3,937 victims (28.3 percent) were slain by “other known” offenders. The offenders were not known for 6,808 murder victims (48.9 percent). Bar graphs: The first bar graph provides a breakdown of the 1,810 familial relationships of victims to offenders based on supplementary homicide data from 2019: 85 husbands were killed by their wives, 482 wives were slain by their husbands, 166 mothers were murdered by their children, 178 fathers were killed by their children, 259 sons were slain by their parents, 171 daughters were murdered by their parents, 115 brothers were killed by their siblings, 27 sisters were slain by their siblings, and 327 victims were murdered by other family members (i.e., familial relationships other than those mentioned above). A second bar graph depicts the 3,937 “other known” (that is, nonfamilial) relationships of victims to offenders based on supplementary homicide data from 2019: 2,778 victims were killed by acquaintances, 345 were slain by friends, 187 boyfriends were murdered by their girlfriends, 505 girlfriends were killed by their boyfriends, 100 victims were slain by their neighbors, 13 employers were murdered by their employees, and 9 employees were killed by their employers.