The aircraft came under fire at around 3:00 pm (1200 GMT) during a flight to Goma, the provincial capital of Nord-Kivu province, where it was able to land, a spokesman told AFP.
The source of the fire that struck the helicopter was not yet known and its precise location had yet to be determined, said Amadou Ba, a spokesman for the UN mission in the DRC (MONUSCO).
South Africa's military also confirmed the incident.
"An Oryx helicopter came under fire in Goma, the Democratic Republic of the Congo on Sunday February 5, 2023," the South African National Defence Force (SANDF) said in a statement.
"A crew member was fatally shot, another suffered injuries but managed to continue flying the chopper and landed safely at Goma Airport.
On March 29, 2022, eight UN peacekeepers -- six Pakistanis, one Russian and one Serb -- were killed when their helicopter crashed over a combat zone between the Congolese army and M23 rebels.
Militias have plagued the mineral-rich eastern DRC for decades, many of them a legacy of regional wars that flared during the 1990s and the early 2000s.
Since November 2021, the M23 rebel group has seized chunks of territory and come within miles of the east's main commercial hub Goma.
MNA/PR