It was upon the untimely death of this good man, however, that the stepmother's true nature was revealed.

8 seconds sound clip from the Cinderella (1950) movie soundboard.

You can hear this line at 00:02:23 in the Blu-ray version of the movie.

Quote context

[...]

- In the sweetest story ever told.

- Once upon a time, in a faraway land, there was a tiny kingdom, peaceful, prosperous, and rich in romance and tradition.

- Here, in a stately chateau, there lived a widowed gentleman and his little daughter, Cinderella.

- Although he was a kind and devoted father, and gave his beloved child every luxury and comfort, still, he felt she needed a mother's care.

- And so, he married again, choosing for his second wife a woman of good family, with two daughters just Cinderella's age, by name, Anastasia and Drizella.

- It was upon the untimely death of this good man, however, that the stepmother's true nature was revealed.

- Cold, cruel, and bitterly jealous of Cinderella's charm and beauty, she was grimly determined to forward the interests of her own two awkward daughters.

- Thus, as time went by, the chateau fell into disrepair. For the family fortunes were squandered upon the vain and selfish stepsisters...

- While Cinderella was abused, humiliated, and finally forced to become a servant in her own house.

- And yet, through it all, Cinderella remained ever gentle and kind.

[...]