Murder on the Blackboard
Hildegarde Withers
Inspector Oscar Piper
Addison
Jane Davis
Detective Smiley North
Detective Donahue
Mr. MacFarland
Leland Stanford Jones
Otto Schweitzer, the Janitor (as Fredrik Vogeding)
Louise Halloran
Dr. Max Von Immen
Detective McTeague
Dr. Levine
Bearded diner (Uncredited)
School boy (uncredited)
Diner Counterman (uncredited)
Policeman (uncredited)
