Auckland Police are appealing for information about another vehicle, in relation to the death of American PHD student Kyle Whorrall

The 33-year-old was fatally attacked at a bus stop in Meadowbank last Saturday.

A teen faces a murder charge and a 32-year-old woman is charged with being an accessory after the fact.

Detective Inspector Glenn Baldwin is asking occupants of a silver Mitsubishi Grandis to make contact with Police.

He says they could have information that will help investigators understand why Whorrall was killed.