- Who's Jackson?
- He's the last man who saw Dietrichson alive.

4 seconds sound clip from the Double Indemnity movie soundboard.

You can hear this line at 01:01:54 in the DVD version of the movie.

Quote context

[...]

- You find this an uncomfortably warm day, Mr. Keyes?

- I'm sorry, but I didn't know this was formal.

- Sit down, gentlemen.

- Thank you.

- Any new developments?

- I just talked to this Jackson long distance, up in Medford, Oregon.

- Who's Jackson?

- He's the last man who saw Dietrichson alive.

- They were out on the observation platform together, talking.

- Dietrichson wanted a cigar and so Jackson went back to get Dietrichson's cigar case for him.

- When he returned to the observation platform, no Dietrichson.

- Well, Jackson didn't think anything was wrong until a wire caught up with the train at Santa Barbara.

[...]