Something from castingworkbook.com:
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DEAD ZONE 4020
"THE HUNTING PARTY" Synopsis
Anti-establishment and anarchical radio talk show host Mitchell Frost has been speaking out about vice president Danburry on the air- thanks to Frost's ultra confidential source "The Wolf" (a la Deep Throat). When the paranoid Mitchell Frost's life collides with Johnny's, it turns out no conspiracy theory is too far fetched....."
Didn't Johnny's life already collide with an radio talk show host's life? In Season 3? Since this mentions a conspiracy, I hold out a shred of hope that it's arc-related. Maybe this is a set-up for the testimony in Ep 21.