It happened to be my daughter, Katherine.
5 seconds sound clip from the Bullets or Ballots (1939) classic radio play.
You can hear this line at 00:42:16 in the radio play.
Quote context
[...]
- You went to the Derby because I found a tiny spot of sauce used for a seafood cocktail.
- Well, that's for you to reveal.
- It happened to be my daughter, Katherine.
- And thanks for the invitation here tonight.
- The trap is ready to spring, but Bugs Brenner arrives at Kruger's apartment first.
- He faces the leader a revolver in his hand.
[...]