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#4. The Chemist

#4. The Chemist:

A famous chemist was murdered in his own lab. 

There was no evidence of any crime except for a piece of paper with the names of 5 chemical substances on it:

Carbon
Nickel
Oxygen
Sulphur
Lantanhum

On the day he was murdered, the chemist had only 3 visitors: his wife Mary, his nephew Nicolas, and his friend Johnathan. Who did the police arrest?

Did you solve the riddle?!