Radioland Murders ending explained (spoilers)

[afycumi]

Roger solves the mystery and exposes the killer's identity during the Gork Son of Fire show. Max Applewhite is the killer. He killed the general and the others because years ago they ceased to support Max with his latest invention: television (and they tried to take it away from him). Max takes Penny hostage to the top of a tower. He is shot down by a plane. Roger and Penny get back together.