A computer belonging to New Zealand student Blazej Kot, 25, was used to look up "how to kill" on the night his wife's throat was cut, an American court has been told.

Kot, who is facing charges of murder, arson and tampering with physical evidence, allegedly also used the computer to find information on the jugular vein by typing "how+to+kill+ neck+aretery" (sic) into an internet search engine.