Ooooh.
Could be Eric or Baron Samedi, sent by Eric, who zombified him. Could also mean Sean Renard, whose motives were even more unclear in the first season. Could also have meant Kimura, who came after Nick for the coins at the end of the first season.
Could even mean his son, not yet conceived at that point.
However, anything related to the Mellifer (bee people) apart from their enemy, the Hexenbiests, has apparently been forgotten about, so who knows?