Police have released the name of the motorcyclist who was found dead on State Highway 1 north of Bulls yesterday.

He was Gregory John Spargo, 50, from Auckland.

The man's body was found just off the road by a motorist about 7.20am. Police said his body could have been lying unnoticed for several hours.

The Serious Crash Unit investigation was ongoing.

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The death brought the holiday road toll to six.