Amos Feathergill
- Assistant District Attorney.
William M. Moran
- Commanding Officer of the Detective Bureau.
Ernest Heath
- Sergeant of the Homicide Bureau.
Snitkin
- Detective of the Homicide Bureau.
Guilfoyle
- Detective of the Homicide Bureau.
Burke
- Detective of the Homicide Bureau.
Tracy
- Detective assigned to District Attorney's office.
Deputy-Inspector Conrad Brenner
- Burglar-tools expert.
Captain Dubois
- Finger-print expert.
Detective Bellamy
- Finger-print expert.
Peter Quackenbush
- Official photographer.
Dr. Doremus
- Medical Examiner.
Swacker
- Secretary to the District Attorney.
Currie
- Vance's valet.
