A man who plummeted 600 metres to his death on New Zealand's Aoraki Mt Cook was an experienced Swedish climber and cameraman who had previously scaled the mountain's east face.

Magnus Kastengren, 32, died while skiing with his friend and professional skier Andrea Fransson, also from Sweden.

The pair were traversing on skis near the lower summit of the mountain on Sunday morning, when Mr Kastengren slipped and fell.

Fransson, who was named Sweden's Adventurer of the Year in 2011, alerted authorities to the accident and returned with rescuers to recover Mr Kastengren's body.

The pair were climbing various mountains as part of what Fransson labelled their New Zealand ski adventure, and had skied Mt Cook's east face and climbed and skied Mt Aspiring.

In 2011, the pair scaled North America's highest peak, Denali, together.

"Its great to be back on the road with him, as we haven't matched plans since our very enjoyable Denali trip a few years back," Fransson wrote in his blog last month.

"Hopefully well also get some nice mountains climbed and skied along the way."

Mr Kastengren was also a cameraman on Fransson's documentary Tempting Fear, released this year.

Police say Fransson has returned back to Sweden.