Probably some of you already knows about this, but I've found this wiki page for DF:BHD, with some pre-alpha info that didn't make it to the final cut. It isn't much but I love to read about these things. For example that there was a SPBHD_12, which was cut of.
Anyway, in the mission 'River Raid', originaly you would met with an informant first before heading out to Deka. The devs took this out in the final version but left the informant inside the mission. The Wiki page says the following: "He only appears behind the 4 slum buildings in the south near the weapon warehouse in sitting animation state (interestingly, killing him would lead to mission failure)".
Well, I've tried it and indeed you get a lose message that the informant was killed. I've added a picture of him
Have a nice that guys