The story

Raymond J. Clark III, charged with murder in the death of Yale graduate student Annie Le, was smart, amiable and loved his dog, say those who knew him.

One researcher said he often went by the lab in the Yale School of Medicine building where Le was found strangled and stuffed in a wall. Lufeng Zhang worked with Clark, he said, and thinks the police may have the wrong man.

"He's a nice man, always," he said.

Clark, 24, the same age as Le, was a technician in the school of medicine's Animal Resources Center. While Le, who was pursuing a doctorate in pharmacology, conducted experiments on mice, Clark took care of the rodents and cleaned their cages.

Police will not say whether Clark and Le were acquainted or why they homed in on Clark after Le went missing September 8, less than a week before she was scheduled to marry a Columbia University graduate student who was her college sweetheart. Watch police announce arrest Read full article »

CNN's Eliott C. McLaughlin, Mary Snow, Tom Foreman and Larry King contributed to this report.

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