What happens as the FBI thinks the killer is approaching the safe house? As the reader, did you anticipate this happening? Why or why not?

As the FBI notes activity around the safe house and believes that the killer is approaching, a message comes through online from Maxwell to Lilith. The message starts with "Greetings Dr. Lenz". This is proof that the killer knows about Dr. Lenz's deception online. Rather than come after the decoy at the FBI safe house, the killer has murdered Dr. Lenz's wife. Based on what the author has told the reader about the killer, it was clear that the plan would probably not work, but there was no reason to think that the killer would identify Dr. Lenz and murder his wife.