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What is this nonsense about Kosha?
You have to be an idiot to have unlimited, overpowered Voltigore at your disposal and still use the weak Drone ability.
I can agree with the machine gunners; there's a good opportunity to "grab" someone else. But I disagree about Voltigore.
The problem is that healing and self-defense aren't displayed. If the machine gunner killed Kosha, then Shepherd probably took damage too, but his defense saved him.
A hail of bullets from an automatic weapon? That seems doubtful. And lol, what's the point of marines killing with anything other than a machine gun?
By the way, an Assassin could also have been the culprit, but I doubt the operatives wouldn't have used Wolker. Assassins have a good passive ability, but too much isn't displayed in this game, so you can't determine the mafia member just by looking at the kill log.