He could've died in the getaway car and the others dropped him in the river.
5 seconds sound clip from the The Asphalt Jungle (1950) movie soundboard.
You can hear this line at 01:12:24 in the Blu-ray version of the movie.
Quote context
[...]
- Yes. We went over that list together.
- Mm-hmm. The coroner says he was plugged about 1:00 or 2:00 this morning.
- Not much after the Belletier job was pulled.
- We figure there might be a connection.
- One of the heist guys was shot. We know that. There was blood on the floor. Maybe it was Brannom's.
- He could've died in the getaway car and the others dropped him in the river.
- Oh, no, no, no. Bob's a good deal of a roughneck, but he's no criminal.
- And if I'm any judge, Belletier's was the work of big-time professionals.
- Oh, no, no, gentlemen. Bob mixed up in any burglary. Why, that's inconceivable.
- I see. Oh, uh, one more thing, just for the record, of course.
- Could you give us an account of your whereabouts last night?
[...]