Three people arrested over the suicide of a multiple sclerosis sufferer will not face prosecution, it has emerged.
Caroline Loder, 48, who was known as Cari, took her life at her home in Silo Road, Farncombe, on 8 June 2009.
Right-to-die campaigner Libby Wilson, an 84-year-old former GP, and two men were previously arrested in connection with her death.
The Crown Prosecution Service (CPS) said no charges were to be brought against the trio.
Dr Wilson, a member of pro-euthanasia group Friends At The End (Fate), was arrested by Surrey Police in September.
She was questioned on suspicion of aiding, abetting, counselling or procuring a suicide.
Two men, one in his 70s from Godalming, Surrey, and one in his 50s from west London, were also arrested in connection with the death of Ms Loder, an academic.
The CPS said there was not enough evidence to prosecute one of the men.
A spokeswoman added it would not be "in the public interest" to pursue a prosecution against the other man and Dr Wilson.
She said Dr Wilson had offered "minimal" assistance to Ms Loder in giving some advice.
"Ms Loder had plainly intended to commit suicide, and there is no evidence that the advice given contributed significantly to the outcome," she added.
The spokeswoman said the man had helped Ms Loder in her preparations but it was clear he had acted out of compassion.
In a statement, Fate said Dr Wilson, who lives in Glasgow, was "relieved" to learn of the decision.
Under current legislation, assisting suicide is illegal and carries a jail term of up to 14 years.
Last September, the director of public prosecutions Keir Starmer QC spelled out the range of factors that would be taken into account when deciding on cases.
These include whether there was a financial motive and looking into how the decision to die was made.