They shot him at close range.
3 seconds sound clip from the The Good, the Bad and the Ugly (1966) movie soundboard.
You can hear this line at 02:06:17 in the Blu-ray version of the movie.
Quote context
[...]
- Blondie, I'm very happy you're working with me, and we're together again.
- I get dressed, I kill him and be right back.
- Oh, listen, I forgot to mention, he's not alone. There's five of them.
- Five?
- So that's why you came to Tuco?
- It doesn't matter. I'll kill them all.
- They shot him at close range.
(WHISTLING CANNONBALL, EXPLOSION)
- The other one will be along.
- They'll come looking for us. Watch out. There's two of them.
[...]