It's always the quiet ones...probably had a ton of explosives in the basement, several hundred machine guns in the bedrooms, and thousands and thousands of rounds of ammo in the garage. A typical suburban homeowner, just like all the 'em around here...oh, wait. I live in Idaho. 8-)

Seriously, you can't tell by looking. It could be that he had child pornography on a home computer. He could have been selling dope. Could simply be embezellment.