Here is a segment from a television program about the history of radio. Not sure of the name of the television program (perhaps it was Remember When...?), but the episode appears to be titled "When Radio Was." Dick Cavett was the host.
The segment included below covers radio entertainment at night, and Suspense is the first show mentioned. Unfortunately, they don't go into much detail about the show, but there is a little bit of film footage of Peter Lorre performing part of his monologue from "Nobody Loves Me."
If you are interested in watching the whole documentary you can find it in segments on YouTube.