I included some choice quotes, but please read the whole thing for full context. The accounts and documentation are posted under the References section.
We were prompted to act following the harrowing eyewitness accounts of former UK diplomat Craig Murray and investigative journalist John Pilger, who described Assange's deteriorated state at a case management hearing on Oct 21, 2019.
Assange had appeared at the hearing pale, underweight, aged and limping, and he had visibly struggled to recall basic information, focus his thoughts, and articulate his words. At the end of the hearing, he "told district judge Vanessa Baraitser that he had not understood what had happened in court".
On May 31, 2019, the UN Special Rapporteur on Torture, Nils Melzer, reported on his May 9, 2019, visit to Assange in Belmarsh, accompanied by two medical experts: "Mr Assange showed all symptoms typical for prolonged exposure to psychological torture, including extreme stress, chronic anxiety and intense psychological trauma."
On Nov 1, 2019, Melzer warned, "Mr. Assange's continued exposure to arbitrariness and abuse may soon end up costing his life"
It is our opinion that Mr Assange requires urgent expert medical assessment of both his physical and psychological state of health. Any medical treatment indicated should be administered in a properly equipped and expertly staffed university teaching hospital (tertiary care). Were such urgent assessment and treatment not to take place, we have real concerns, on the evidence currently available, that Mr Assange could die in prison. The medical situation is thereby urgent. There is no time to lose.