Since last year, authorities have been investigating a possible link between the BTK serial killer and Cynthia Kinney, who went missing in Oklahoma in 1976 at age 16. Now they're taking another look at a crossword puzzle sent by the convicted killer, Dennis Rader, to a TV station in 2004, the Guardian reports. He included names, places, or other words related to his victims, of which there were at least 10 between 1974 and 1991. Newly discovered words included in the puzzle, per KFOR: