From The Perry Mason TV Show Book (Revised)
Obnoxious talk show host Barney Austin is the hottest thing on radio. One night on his midnight call-in show, Barney gets a note to call his boss, wealthy Kevin Steele. While Barney is talking to Steele on the air, the audience hears Steele argue with someone and then two shots ring out.

Steele was murdered all right, and Perry, in a twist of the plot, becomes a key witness for the prosecution. Watch for Daniel Travanti, Captain Furillo of Hill Street Blues, as Barney Austin.