My current candidate for Red John is Dr. Linus Wagner. He even says “for the record, I am sorry about your family”.
Look what I have found: http://www.plantzafrica.com/plantcd/cucumismet.htm Could be the poison used on Rebecca!
And here is the important note: They all have African connection. Wagner sponsored African children. Timothy Carter grew up in Africa and was born to a missionary who worked in Africa.
I just have to find the other connections. Higher path, Patrick, Higher path!