IMO, KR was killed because those murdering murderer's knew he would come after their cowardly butts.
Big tough men

(uh, not) when they ran like rabid dogs in a pack and caught the victims asleep or off guard, and basically assassinated this family.
I was hoping and praying to God that the little ones were not in these homes when their parents were killed, but my hopes have dwindled to just a flicker now.
As to when KR was killed, I think it was first, and as to WHO shot him in the eye, my guess might be off and unrelated, so my lips are zipped for now.

All JMO!