The name of the male pilot would be released once next of kin had been notified, Senior Sergeant Ian Kerrisk, of Alexandra, said.
Investigations were set to resume at the crash site this morning, with investigators from the Civil Aviation Authority (CAA) and the Transport Accident Investigation Commission (TAIC) expected to examine the scene.
Conditions were fine at the time of the crash, police said last night.
Glenorchy Air chief pilot Robert Rutherford confirmed the flight was on a Lord of the Rings tour at the time of the crash and said "we are waiting to get all the information before we talk to the media".
"We still don't know what happened ... we know there are some injuries but we are still waiting to hear the final details," he said.
"As you can imagine, we are under a huge amount of stress."
The company's Lord of the Rings tour -- which costs $380 a passenger -- includes a visit to the reservoir, which was depicted as "Rohan country" in the popular trilogy.
"This flight includes approximately two hours on the ground at Poolburn, there is a walk from the landing strip to view the scenery and have a close look at the sites of the filming. Your pilot will tell you all about the making of the Trilogy as you go," the company's website says.
The website says Glenorchy Air is a family-owned business operating out of Queenstown Airport, and "we have a 100 per cent safety record".
"No one flying with us since we started our business 21 years ago has been injured."
A Piper Cherokee with the same registration was steered off the side of the grass airstrip to avoid overrunning the runway at Elfin Bay, Lake Wakatipu, on April 5, 2007. The pilot and two passengers were uninjured when the aircraft received moderate damage after striking a fence, prompting a TAIC investigation.
