So 80% of known killers are apprehended, 20% aren't? That sounds totally believable - in reality, many communities most affected by homicides are places where p

So 80% of known killers are apprehended, 20% aren't? That sounds totally believable - in reality, many communities most affected by homicides are places where police can't guarantee your safety, so speaking to the police could get you targeted as well. Or the people who know the killlers identity are more inclined to just do the killing themselves, rather than wait for police. Moreover, it's tough for a interpersonal conflict to rise to the level of homicide without someone else noticing.