Only 20% of murders are committed by strangers. That's what I meant when I misspoke.
http://www.bjs.gov/content/pub/pdf/mf.pdf
The trouble with that fact:
It is for murder convictions only
It is based on 1994 data
It idoes not tell you that rival gang members know each other, they are considered an "aquaintance" rather than a stranger.
Accordong to FBI Uniform Crime Reports official statistics for 2011(latest avalbale)
Total Homicides in the US in 2011: 12,664
Husbands murdered 108
Wife murdered 552
Mother murdered 123
Father murdered 130
Son murdered 263
Daughter murdered 182
Brother murdered 86
Sister murdered 29
Other family murdered 279
TOTAL FAMILY HOMICIDES =1752.... or
less than 14% of all homicides.
Continuing with the listing:
Acquaintance murdered 2,700
Friend murdered 377
Boyfriend murdered 161
Girlfriend murdered 474
Neighbor murdered 107
Employee murdered 10
Employe rmurdered 14
Stranger murdered 1,481
Unknown relationship murdered 5,588
Your link is based on 1994 data and only covers those cases prosecuted to conviction. You will note from my data that the lagest sigle category consists of "Unknown relationship". This is because the murder has not been solved, no conviction.. disproportionately associated with stranger homicides.
Link for my data:
FBI ? Expanded Homicide Data Table 10