American father-of-two Mr Ewert died in September 2006 after drinking a mixture of sedatives and using his teeth to turn off his ventilator.
The former academic allowed his death to be filmed for a documentary, Right to Die?, made by Oscar-winning director John Zaritsky, which is due to be shown on Sky Real Lives later.
His film shows Mr Ewert outlining his options as "death, or suffering and death".
Before his death, Mr Ewert said: "I'd like to continue.
"The thing is that I really can't.
"When you are completely paralysed, can't talk, can't walk, can't move your eyes, how do you let someone know that you are suffering?"
In a letter he wrote to his two adult children, who feature in the programme, he said: "This is a journey I must make.
"At the same time I hope this is not the cause of major distress to my dear, sweet wife, who will have the greatest loss, as we have been together for 37 years in the greatest intimacy."
Prime Minister Gordon Brown told parliament: "These are very difficult issues and we should all remember that at the heart of any single individual case are families and people in very difficult circumstances who have to make for themselves very difficult choices, none of us, none of us would want to go through that."
But he added: "On specifically the programme itself, I think it's very important that these issues are dealt with sensitively and without sensationalism.
"I hope broadcasters remember that they have a wider duty to the general public and of course it will be matter for the television watchdogs when the broadcast is shown."
Writing in the Independent, Mrs Ewert said: "For Craig, my husband, allowing the cameras to film his last moments in Zurich was about facing the end honestly.
"This wasn't a film about him personally. He was keen to have it shown because when death is hidden and private, people don't face their fears about it.
"They don't acknowledge that it is going to happen, they don't reflect on it, they don't want to face it. That's the taboo."
Mr Zaritsky told BBC Radio Four's Today programme: "I think it would be less than honest if we were to do a film about the process of assisted suicide and not actually be able to see the ultimate, you know, act as it were.
"Otherwise we'd be left open to charges that the death was unpleasant, or cruel or wasn't even done willingly.
"And by putting it out there in its entirety, people can judge for themselves."
Barbara Gibbon, Head of Sky Real Lives, said: "This is an issue that more and more people are confronting and this documentary is an informative, articulate and educated insight into the decisions some people have to make.
"I think it's important that TV broadcasters, and particularly Sky Real Lives, can stimulate debate about this issue through powerful, individual and engaging stories and give this subject a wider airing."
Media regulator Ofcom said it did not act on any programmes until after they had been transmitted.
A spokesman said: "All UK broadcasters must adhere to the Broadcasting Code which sets standards for the content of TV programmes.
"The code contains clear rules about the portrayal of self-harm and suicide in order to protect people from harm.
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