who will be the first killed person in the team?

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After watching the season0406 I think that must be someone leave the team, then who will be the first person? In the forshow we heard that the computer guy will appear in the beginning volumes and we saw he picked the notepaper which has the telephone number of the balck guy, then what he will do? call him? or escape the team? he will be the first killed person perhaps, do you have any opinion?