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Was working out at the campus gym.

Had been getting up really early recently.

The investigators scoured Cho's room for evidence.

The room looked like any college kid's, strewn with papers, food wrappers, cereal boxes.

Other officers walked the halls of Harper with a photograph of Cho, asking students if they knew him.

They were all rattled.

Most did not recognize him; a few said they thought they had walked past him now and then.

How lucky they were, thought Tom Duscheid, a management student from Pittsburgh.

This is the residence hall where Cho lived, not West Ambler Johnston Hall.

What if he had rampaged through here with his guns?

There were still so many unanswered questions.

Why did Cho go to West Ambler Johnston Hall?

Why did he choose Norris Hall for his rampage?

Whom was he looking for?

How did he move around the campus unnoticed?

Police questions, questions of detail.

They went to work on some of the little stuff, tracing Cho's movements.

They found out that on Feb.

9, he had stepped into JND Pawn Brokers, a pawnshop directly across Main Street from the Tech campus, to make the first purchase of the guns he would use later.

It was a Walther .22-caliber pistol - relatively inexpensive, commonly used for target shooting.

From then until days before the shooting, he traveled to nearby stores to buy ammunition.

Some at the Wal-Mart Supercenter, some at Dick's Sporting Goods over in Christianburg.

On March 16, exactly a month b...

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