hay lord no i couldnt do that....she speaked then i attacked but some dead guy came....i killed him i read its spose to be Jake? wtf? was jake supposd to b alive?
so now jake is deded what happens? thx for answein btw
You mustn't kill Jake! He should disappear before the fight (and after your dialogue with Evelyn in the cave) and reappear after you killed Evelyn and her summons. He's not an enemy of you and you need him for the quest progression.
So best solution would be to reload before the Evelyn fight and try to keep him alive until he disappears.