In the first hour of Wednesday's 8-23 Situation Room, CNN apparentlythought it had a phoner with Wendy Hutchens, a woman "who claims that five years ago she had detailed chats about the death of JonBenet Ramsey" with John Mark Karr.
"...he was instructed to kill JonBenet by Howard Stern"
The caller was a "notorious prank caller" named Thomas Cipriano. He says: "I've been doing this for 20 years! You'd think they'd be on to me by now..."
http://www.mediabistro.com/tvnewser/cnn/wolf_weve_just_been_howard_sterned_42609.asp
The clip is much longer than necessary, but the exchange with the "crack" [sic] caller is at the beginning.
On a personal note, I watched the entire clip because I rarely am exposed to CNN and always find it visually fascinating. The graphics get more sophisticated, ...and it's slightly distracting to those unaccustomed to it. There is never a moment without considerable motion on the screen, even when the talking head is just taking. It's a way of helping the short attention-spanners keep their eyes on the tube. (Charlie Rose, with conversants sitting at a table, the background a uniform black void, is the antithesis of the ever-waving background of CNN; with Rose, you're on your own to supply the attention and brain activity to maintain focus on the conversation. my $.02