That's a super careful wording when you realize two thirds of all people are killed by someone close to them.
The article says that 75% are killed by people close to them. Of the remaining 25% killed by strangers, two-thirds of those are killed by non-police-officers.
75% killed by people close to them (not sure if they showed police close to them deaths)
16.6% killed by a stanger
8.3% killed by a police stranger (not that that is good!)