Kris is unaware that Jake's nephew chose her to stay in the house with Jake because she was the double for the late Rosemary. The nephew was hoping to help Jake remember the night his wife was killed.
Kris was right when explaining to Sabrina, Kelly, and Bosely like as if this reenactment was like a time machine.
Kris was able to remain calm and was on her own in finding out who was the real killer was the detective who was hired out by Renaldi. He said it was hard to see and he accidentally shot Rosemary.
This episode made me think Jake was the killer, but at the end the truth came out that the detective was the killer.