Visible crew/equipment: About half way through there is a shot that shows Jonathan sitting in his living room. On the right-hand side of the screen we can see the windows and it's dark outside. Even so, you can see a cameraman holding a camera moving along the window filming Jon from behind.
Visible crew/equipment: In the bookstore, when Sarah is passing boxes down to Jonathan, the boom mic drops into frame for several seconds.
Answer: John's wife was murdered when she was drowned by the construction worker. The construction worker was under the control of shadow demons who made him kill countless people. John's wife Anna included.