Taranaki Alpine Cliff Rescue member Jeremy Beckers was flown out by rescue helicopter to the incident just after the sun had set on Sunday.
“Our job was to get the gentleman off who had been killed,” Beckers said.
Beckers understands the tramper was travelling with someone else when he was struck from above by the boulder.
“He was hit by a large rock... they come down pretty hard when they fall,” Beckers said.
The man appeared to have been killed by the boulder on the main route towards the summit, around 2000 metres up.
Beckers said most alpine people would be aware of the risk of rocks and ice falling on Mount Taranaki.
DOC Taranaki Operations Manager Gareth Hopkins said the fatality occurred at the North Ridge of Mt Taranaki Summit Track.
“The death of the tramper yesterday is a reminder of the inherent risks of recreation in the alpine environment. People planning to visit Taranaki Maunga and undertake these activities need to understand the danger the mountain presents.
“Our condolences go to those impacted by yesterday’s incident,” Hopkins said.
Taranaki Mountain Shuttles won’t operate on Tuesday and Wednesday while the company observes a rahui “out of respect and cultural protocol” after the death.
The bus company said the rahui would last two days “or as long as directed”
The death will be referred to the Coroner.