- It was suicide, Allen.
- What drove him to it?

3 seconds sound clip from the The Picture of Dorian Gray movie soundboard.

You can hear this line at 01:19:31.693 in the Blu-ray version of the movie.

Quote context

[...]

- What has that to do with you?

- What you have got to do is to destroy the thing that is upstairs. Destroy it so that not a vestige is left.

- Nobody saw this person come into the house. He is supposed to be in Paris. When he is missed, not a trace of him must be found here.

- You must change him and everything that belongs to him, including his coat and his travelling bag, which I have locked up in this room into a handful of ashes.

- You must be insane to suppose I'd lift a finger to help you.

- It was suicide, Allen.

- What drove him to it?

- You won't do this for me?

- How can you ask me, of all men, to mix myself up in this horror?

- It was murder. I killed him. He was responsible for the ruin of my life. He didn't intend it, but the result was the same.

- You are certain to be caught. No man commits a crime without doing something stupid. I'll have no part of it.

[...]