The wife of Tony Nicklinson, a man with locked-in syndrome who died a week after losing a legal bid to end his life, is to appeal against the ruling.
Mrs Nicklinson said she would appeal against the decision because "nobody should have to suffer like Tony did".
Her 58-year-old husband was paralysed from the neck down after suffering a stroke in 2005.
He died from pneumonia at home in Wiltshire on 22 August after refusing food and fluids.
Lawyers acting on Mrs Nicklinson's behalf said they believed her case was "strong and compelling".
'Wide public significance'
Saimo Chahal, from solicitors Bindmans LLP, said it was evident from recent polls that some 70% of the public considered there should be a change in the law.
"The case has very wide public significance which should be considered by the Court of Appeal and if necessary by the Supreme Court," she added.
Mrs Nicklinson said she was delighted to continue what her husband had started.
"I feel very strongly that this issue should be addressed.
"It is too late for Tony but I hope that we can now help those who find themselves in a similar position," she added.
Mr Nicklinson lost his High Court case to allow doctors to end his life without fear of prosecution on 16 August.