Contact lenses

Was working out at the campus gym.

Had been getting up really early recently.

The investigators scoured Mr.

Cho's room for evidence.

According to a search warrant filed later by Virginia state police, they took chain, a folding knife, a combination padlock, a computer, assorted books, documents, notepads, writings, a tool box, compact discs, a digital camera, keys, a Citibank statement, and six sheets of green graph paper.

Other officers walked the halls of Harper with a photograph of Mr.

Cho, asking students if they knew him.

They were all rattled.

This is the residence hall where Mr.

Cho lived, not Ambler Johnston.

What if he had rampaged through here with his guns?

The police went to work tracing Mr.

Cho's movements.

They found out that on Feb.

9 he went to JND Pawn Brokers to buy one of the guns he would use.

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.

On March 16, he went to Roanoke Firearms and paid $571 for a Glock 19 and a box of 50 cartridges.

Days later, a larger clue would come from NBC News and Mr.

Cho himself.

At 9:01 Monday morning, before going to Norris Hall, Mr.

Cho sent an Express Mail package...

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