A teaching student from Sydney died after she slipped off and fell down 20 meters off Empress Falls while on a hike with three people at Blue Mountains National Park on Tuesday afternoon.

Cheng Shi Min, also known as “Angel” by close family and friends, was with her boyfriend Henry Yendle, her father and a friend when the accident took place at around 1:30 p.m.

She was peering over the edge of the top of the waterfall when she lost her footing and plunged to her death, her boyfriend revealed, according to the Sydney Morning Herald.

“Essentially she was looking over the edge of the top of the falls up there, and she slipped down. First I sort of just heard a scream and then a loud bang,” Yendle said.

Cheng was then approached by paramedics and fire and rescue at around 2 p.m. and provided with treatment.

Strong winds and severe weather conditions prohibited a helicopter rescue, so she was placed on a stretcher and was evacuated from the area by foot, where they reached the Conservation Hut in Wentworth Falls before 8 p.m.

She was taken to the Westmead Hospital in critical condition, but succumbed to her injuries in the head and chest and died early Wednesday morning, according to ABC News.

Inspector Kevin McSweeney, a spokesperson for the NSW Ambulance, said the woman was provided transfusions with blood from two neighbouring hospitals.

“There was some extraordinary work by ambulance paramedics and a doctor to stabilise the patient and she was transported up with the help of police rescue and Rural Fire Service,” McSweeney said.

Cheng was originally from Singapore and was studying to become a teacher. She posted numerous photographs of the waterfall, where the accident took place, on her Facebook page last January, admiring the area for its natural beauty.