The verdict of this court is murder by person or persons unknown.

5 seconds sound clip from the The Mummy (1959) movie soundboard.

You can hear this line at 00:30:06.600 in the Blu-ray version of the movie.

Quote context

[...]

- Help! Help! Help! Help! Help!

- The very nature of this deed points to the fact that it was committed by some homicidal maniac.

- And if it were not for the evidence of forced entry, I would have no hesitation in telling the doctor of the nursing home to look among his own inmates.

- However, there is no doubt that the perpetrator of this crime came from outside the nursing home and left the premises immediately after the crime.

- I can only exhort the police to do everything in their power to apprehend this individual with the utmost dispatch.

- The verdict of this court is murder by person or persons unknown.

(Judge hitting gavel)

- Person or persons unknown.

- Coroner said it was the work of a maniac.

- I can't believe that. There must be a motive somewhere.

- We must go through his papers. Perhaps we'll find something there.

[...]