Ya know, it could be just an uncanny coincidence. Or, at the time he wrote it, the whole thing was a fantasy. Maybe he didn't anticipate any of it to actually take place. (Explains why the details don't match up, though the part about losing it while the police find the body does reflect what he wrote about feigning insanity after comitting a murder.) But eventually it does, and on that Thursday when the area is filling up with emergency vehicles, LE officials, spectators and news vans, McD peeks out of his upstairs window and sees the reporters talking to bystanders, (the same window through which he observed the scene after LG's dog was hit by a car). By his own admission, he could see everything through that window. No doubt he could tell from the types of vehicles and where the attention was focused that "something" had been discovered. He would've known that reporters would be eager to interview him once he made it known that he was the next door neighbor who had been involved in a search for Lauren the previous night. So just maybe, being fully aware of the scene unfolding outside his door, he decided to play it out as written.
