It was Dietrichson's daughter, Lola.
4 seconds sound clip from the Double Indemnity movie soundboard.
You can hear this line at 00:32:47 in the DVD version of the movie.
Quote context
[...]
- So I had to get him to sign without his knowing what he was signing.
- And I wanted another witness besides Phyllis to hear me give him a sales talk.
- A couple of nights later I went to the house.
- Everything looked fine, except I didn't like the witness Phyllis had brought in.
- It was Dietrichson's daughter, Lola.
- The only way you can protect yourself is by having a personal policy of your own.
- If we bought all the insurance they can think up we'd stay broke paying for it, wouldn't we, honey?
[...]