Warner Oland
Charlie Chan
Acting
Boris Karloff
Gravelle
Acting
Keye Luke
Lee Chan
Acting
William Demarest
Sergeant Kelly
Acting
Guy Usher
Inspector Regan
Acting
Margaret Irving
Mme. Lilli Rochelle
Acting
Gregory Gaye
Enrico Borelli
Acting
Nedda Harrigan
Mme. Lucretia Borelli
Acting
Frank Conroy
Mr. Whitely
Acting
Charlotte Henry
Mlle. Kitty
Acting
Thomas Beck
Phil Childers
Acting
Maurice Cass
Mr. Arnold
Acting
Tom McGuire
Pop Morris - Stage Doorman
Acting
Marc Lawrence
Undetermined Minor Role (uncredited) (unconfirmed)
Acting
Joan Woodbury
Dancer in Opera (uncredited)
Acting
William Bailey
Detective (uncredited)
Acting
Charles Bancroft
Soldier in Opera (uncredited)
Acting
John Bleifer
Murdered Orderly (uncredited)
Acting
Stanley Blystone
Backstage Cop Who Shoots Gravelle (uncredited)
Acting
Myrta Bonillas
Villager in Opera (uncredited)
Acting
Raymond Brown
Guard (uncredited)
Acting
Carita Crawford
Dancer in Opera (uncredited)
Acting
Patrick Cunning
Villager in Opera (uncredited)
Acting
Zari Elmassian
Mme. Rochelle (singing voice) (uncredited)
Acting
Frank Fanning
Cop (uncredited)
Acting
Jim Farley
Detective (uncredited)
Acting
Adolph Faylauer
Opera Spectator (uncredited)
Acting
Larry Fisher
Cop (uncredited)
Acting
Benson Fong
Opera Supernumerary (uncredited)
Acting
J. C. Fowler
Opera Spectator (uncredited)
Acting
Otto Fries
Innkeeper (uncredited)
Acting
Bud Geary
Cop (uncredited)
Acting
Milton Gowman
Villager in Opera (uncredited)
Acting
Herschel Graham
Villager in Opera (uncredited)
Acting
Harrison Greene
Detective (uncredited)
Acting
Julia Griffith
Opera Spectator (uncredited)
Acting