It would be stupid, if anybody involved with the murders threatened KD.
- If KD was threatened, he would assume he was on to something important, so he would double down his efforts.
- The person doing the threatening, would likely be involved with the murders, and this would give law enforcement another avenue of investigation.
- Those involved in the murders want the case to go away quietly, threats only create publicity.
- If people involved live overseas, they probably do not know or care who KD is.