A Killer’s Confession, the band fronted by Waylon Reavis (ex-Mushroomhead), have revealed that they will be joined by ex-Mushroomhead vocalist Jason “J Mann” Popson and keyboardist/sampler Tom “Shmotz” Schmitz during their “Victim 1” album release show. That concert is scheduled to take place at The Winchester Music Tavern in Lakewood, OH on September 20. However,…