Those statistics are just false. More reliable numbers are:

  Blacks killed by blacks: 90%
  Blacks killed by whites: 8%
  Whites killed by whites: 82%
  Whites killed by blacks: 15%
  Ratio of whites killed by police to blacks killed by police: 1.857

[1] http://www.politifact.com/truth-o-meter/statements/2015/nov/...

[2] https://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2014/...