Kash
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it was written that the rain washed away all the evidence after Nayra's murder) and Siavash's avatar has rain coming up %)
Added 22 minutes later
Tried to think about it - here's what I came up with:
Let's assume Nayra is a maniac (water, cat's meow). Then it's really beneficial for the mafia to kill her - she swings her axe randomly, she might hit them too! But how could they have figured that out? I would have killed Stan in the mafia's place, because I was sure. Although they have more information: they know each other. So far, everything.