Mom and Dad in the basement!
I don't care what anyone says, they were involved up to their necks.
And what if conclusive DNA evidence matches Karr's?
Check these links out. On the first look at thumbnails of the letters side by side (ransom Note comparison) and then check out the London Letter Exempler sample. The letter "a" which is not pointed out in the side by side comparison are the same in some of the printed "a"s. The second link is from two years after Jon Benets death -written by Dr, Cyril wecht, the pathologist.
http://blabbieville.tripod.com/
http://www.geocities.com/Area51/nebula/9337/unexplained.html