This blog is entirely my own work and research...reproduce it freely in support of the 2nd amendment.
Murder - Crime in the United States 2004
There is 44% odd that can't be accounted for. But for those who the killer is known breakdown for the relationship to the victim breaks down thusly:
Of the homicides for which law enforcement provided supplemental data to the UCR Program, the victim-offender relationship was unknown for 44.1 percent of the victims. For the incidents in which the relationships were known, 76.8 percent of the victims knew their killers and 23.2 percent were slain by strangers. Among the incidents in which the victims knew their killers, 29.8 percent were murdered by family members and 70.2 percent were killed by acquaintances. (Based on Table 2.11.) The 2004 data also revealed that 33.0 percent of female victims were killed by their husbands or boyfriends, and 2.7 percent of the male victims were slain by their wives or girlfriends.
NOTE: This table is based upon incidents where some information about the offender is known by
law enforcement. It excludes incidents reported with a value of "unknown offender."