Sources: FBI Uniform Crime Report: Crime in the United States, 2011.
List Notes: Data is relationship of victim to offender (according to the data killers kill acquaintances far more than they kill fellow co-workers for example). Data is latest available data for the year 2012. Figures are based on 12,664 murders in the United States in 2011 for whom supplemental homicide data was received. Murder as defined here includes murder and non-negligent manslaughter which is the willful killing of one human being by another. The relationship categories of husband and wife include both common-law and ex-spouses.