Paola Marra died at the Swiss clinic on Wednesday, having fought breast and bowel cancer.
The 53-year-old former music industry and charity sector worker teamed up with renowned photographer Rankin beforehand to speak out about assisted dying.
In a film released on Thursday, she said: âWhen you watch this, I will be dead. Iâm choosing to seek assisted dying because I refuse to let a terminal illness dictate the terms of my existence.
âThe pain and suffering can become unbearable. Itâs a slow erosion of dignity, the loss of independence, the stripping away of everything that makes life worth living.
âAssisted dying is not about giving up. In fact, itâs about reclaiming control. Itâs not about death. Itâs about dignity.
âItâs about giving people the right to end their suffering on their own terms, with compassion and respect.
âSo as you watch this, I am dead. But you watching this could help change the laws around assisted dying.â
In an accompanying open letter to party leaders at Westminster, Ms Marra said that, due to the current law, she had to travel to Dignitas alone because she did not want her loved ones âto be questioned by the police or get into troubleâ.
The Canadian, who had lived in London for more than 30 years, wrote: âI resent that I donât have a choice. I think itâs unfair and cruel.
âAnd for so many dying people who canât afford to pay an average of ÂŁ15,000 to travel to Dignitas, this cruel law will force them to endure a painful death, or drive them to take their own lives.â
Rankin said he met Ms Marra on a project over Christmas and had been âflooredâ by her story.
He said: âI felt like I wanted to show somebody who wasnât suicidal.
âShe wasnât depressed, she wasnât unhappy, she wasnât somebody that didnât love her life.
âShe really loved her life and she really wanted her life to mean something. There is a wider purpose to (the film) The Last Request.
âIn doing these photos and this film we wanted to highlight the need to change the legislation around end-of-life care.â
Earlier this month Sir Keir Starmer said he is âcommittedâ to allowing a vote on legalising assisted dying should Labour win the general election.
The party leader made the pledge to campaigner Dame Esther Rantzen, whose revelation that she had joined Dignitas as she lives with stage four cancer has put the subject under the spotlight in recent months.
But Dame Estherâs daughter Rebecca Wilcox said Sir Keirâs commitment would be too late for âthousands of people who are suffering todayâ and has urged Prime Minister Rishi Sunak to âhave a vote nowâ.
Number 10 has previously said it would be up to Parliament whether or not to again debate legalising assisted dying.
In February, a report by MPs warned that the Government must consider what to do if the law is changed in part of the UK or in the Isle of Man or Jersey.
The Health and Social Care Committee said legalisation in at least one jurisdiction was looking âincreasingly likelyâ and suggested the Government must be âactively involvedâ in discussions about how to approach differences in the law.
Assisted suicide is banned in England, Wales and Northern Ireland, with a maximum prison sentence of 14 years.
In Scotland, it is not a specific criminal offence but assisting the death of someone can leave a person open to murder or other charges.
A Bill put forward by Liberal Democrat MSP Liam McArthur to make assisted dying legal in Scotland is expected to come before Holyrood in the coming weeks.
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