[ROCKLOBSTER]

A man with a gun who was spotted in the woods near the school on the day of the incident was an off-duty tactical squad police officer from another town, according to the source.

And if they know that, what exactly was he doing there?

[Uncle Chip]

He probably heard the police dispatch and responded to it and then did what a tactical squad officer is trained to do in a situation like this — sit in the woods and keep your eye out for anyone leaving the scene. I believe this is his photo:

http://www.freerepublic.com/focus/news/2978643/posts?page=175#175