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Pilot Tim Brown (left) and guide Sean Roach named as two dead in Mt Aspiring helicopter crash.

Pilot Tim Brown and guide Sean Roach have been named as the pair who died in a helicopter crash in Mt Aspiring National Park.

The helicopter, a Eurocopter AS350 B3, belonged to The Alpine Group, which is owned by the Wallis family.

In a statement, The Alpine Group confirmed one of its helicopters was involved in the crash in the upper Te Naihi River in South Westland on Sunday morning.