A woman who promised to quit base jumping when she became pregnant has reportedly plunged to her death after she decided to make one final leap.

Wioletta Roslan, 37, died after her parachute failed to open when she jumped from a height of 300m at Via Ferrata cliff near Stechelberg in Switzerland.

Miss Roslan, from Sweden, had leapt from the cliff many times before as it was her favourite base jumping spot.

Her boyfriend, Aleksander Domalewski, jumped alongside her and watched as she desperately tried to get her parachute to open.

Her mother, Halina Zaniewska-Pettersson, said: "He told me that she desperately tried to get her parachute to open without success.

"It did not open and in the last moment she realised she was not going to succeed. He told me that she had simply spread her arms and waited for the impact."

She was four months pregnant.

Mrs Zaniewska-Pettersson added: "I was always terrified every time I knew that she was doing the sport again and I kept expecting the worst – when she said that she was going to do one last jump while pregnant I begged her not to go.

"But she always wanted to carry on. I couldn't force her not to do it – she was old enough to make up her own mind about things.

"All that is left for me now are memories but my daughter lived her life to the full – she was a true adventurer."

Miss Roslan had travelled the world as a professional base jumper after taking up skydiving when she was 19.

In an interview for Swiss television four years ago, she said she could not imagine a life without base jumping, where parachutists take high-risk jumps from cliffs, bridges or buildings.

"I feel alive when I jump. I find normal life boring," Miss Roslan said.

"I know that death always flies with me but we only have a certain amount of time on the earth. When the sun goes down then it's game over whoever you are."

Miss Roslan had previously lived in the Stechelberg region for two years doing whatever job she could find so she could spend her time jumping from local cliffs.

She had said it had been the happiest time in her life and she wanted to go there for a final visit before retiring.

Her friend Ueli Gegenschatz died in 2010 during a failed attempt to jump from the Sunrise Tower in Zurich.