BOULDER, Colo. — When Matthew Harris moved into an apartment building across from the University of Colorado Boulder last year, some residents assumed he was a graduate student.
The modern, three-story building is surrounded by fraternity houses and other homes converted into off-campus housing. Almost everyone renting four-room apartment suites, at $1,600 a month per person, is a student at the university, residents said.
No one, it seemed, knew much about the 31-year-old, who kept a low profile and often dressed in a hooded sweatshirt and jeans.
