It's the fifth anniversary of Down These Mean Streets and the 69th anniversary of the premiere of Richard Diamond, Private Detective. To celebrate both, here's an extra-large episode starring Dick Powell as Diamond. Radio's singing detective gets his man and carries a tune in "The Ralph Chase Case" (originally aired on NBC on May 15, 1949); "The Harry Baker Case" (originally aired on NBC on September 3, 1949); "The Grey Man" (originally aired on ABC on February 16, 1951); and "The Hollywood Story" (originally aired on CBS on August 23, 1953).