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If the target's nickname were displayed, it would be a dead giveaway.
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The clue, as for Revan, is very unusual. The killer is a surgeon?
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Do you think this is a clue?

Do you think they killed without evidence? That seems a bit strange, given that description! Although, killing without evidence makes more sense.
The killer immediately left the scene, and in the morning, when everything was over, nothing was found near the body...
Rudiy's murder is somewhat predictable, but also well-planned, because they knew he was often protected/healed, and therefore they used their ultimate ability. It seems the Mafia is aiming for a 100% victory.

please keep in mind that I studied some of the previous settings and therefore came to this conclusion.