Former army officer U Aung Ko, who is said to be close to Daw Aung San Suu Kyi, has been suffering from heart problems in Insein Prison.
It is feared more political prisoners will be executed by the regime.
With urban resistance groups launching attacks in retaliation for the junta’s hanging of the four activists, Yangon is now one of the world’s most dangerous cities.
A political dissident and a rebel army officer were both executed by the then junta in the 1970s.
Daw Khin Win Tin, mother of executed democracy activist Ko Phyo Zeya Thaw, says she is proud of her son’s sacrifice.
A record number of political prisoners – almost 11,500 – are detained in Myanmar’s jails, but despite inhumane conditions and brutal punishment they continue to defy the junt
Political prisoners are being systematically tortured and forced into hard labor across the country, according to sources.
Anti-coup activists detained by the regime are being refused proper healthcare for injuries sustained in junta beatings.
Prime Minister Hun Sen wrongly claimed on Monday that Sean Turnell, a key advisor to Daw Aung San Suu Kyi, had been released from prison.
The military regime cremated the body of the Yangon University student without informing his family.
Numerous students were reportedly beaten and held in solitary confinement after joining last week’s silent strike.
Danny Fenster was arrested at Yangon’s airport in May and has been held at Insein Prison since then.
Despite its mass amnesty, the junta has so far detained more than 100 people shortly after their release.