Day 163: Mystery Challenge

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A renowned chemist is found dead in his lab. There is no clear evidence except a piece of paper lying by the body. The paper is blank other than the name of five elements scrawled across it hastily:

Nickel
Carbon
Oxygen
Lanthanum
Sulfur

The guard reported that three people visited the chemist that day – his sister, Laura; his colleague, Nicolas; and his wife, Tessa. The criminal was arrested immediately.

Who was it?

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