I must be getting old...

[R@S]

Did you remember to hide all your team members as well? I think the code checks to see if any of them are visible as well once you try to do a "silent kill". And to be absolutely sure, try it when there are no civilians around, if they see you and are allied with Pedro's faction everything will go pear-shape.

And this mission is very tricky, it can take up to 20 tries before you actually succeed, so be patient.

Good luck

[IceShade]

I must have been lucky then. I've always done it on the first go, even with civilians staring at me. Even with the victim just looking at me.

Ask for his pistol, pop him in the head, put the pistol on his corpse .. and wait for the log to be updated. Done.

Remember the very last step; to put the pistol on his corpse. Otherwise, they said, they're forced to shoot you, because it didn't look like a suicide.

[Worbah]

Got it now, Have no idea how, thought it was no different from my 50 other attempts, still somehow succeeded.