I'm not sure I can go on without you, or whatever the hell she was screeching about. I feel like she was going to and still will target Ava. Not sure where Cates was residing--another hotel I guess but she knows Ava resides at the MC. Knock on the door, Ava answers and then bang bang.
At this rate I would not be surprised if Kristina isn't the one responsible for Sam's death when her intended target was Ava. It's either that or mob violence that will claim her life.
I honestly hope it's something normal like a car accident. I always forget that Lucky and Sam were involved. Maybe Lucky's enemies try to get him but get Sam instead.