BTK Confession of a Serial Killer. Word Search Puzzle Solver. BTK Confession of a Serial Killer word Search Puzzle Game. Find words related to movie actors, actresses, and genres. Word Search Puzzle Solver. “BTK: Confession of a Serial Killer” examines the horrific crimes and psyche of notorious serial killer Dennis Rader. From Wolf Entertainment and Good Caper Content this gripping documentary provides unprecedented access into the mind of Rader who is currently serving 10 consecutive life sentences in El Dorado Correctional Facility. This includes identifying and searching for words that are related to : Dennis Rader .