- Khartabil disappeared two years ago
- US State Department considered him a "prisoner of conscience"
Khartabil's fate had been unknown to relatives and fellow activists for nearly two years. According to a Facebook post on Tuesday from his wife, Noura Ghazi Safadi, he was taken to Syria's Adra prison -- one of the country's most notorious -- in October 2015, and executed days after.
"This is the end that suits a hero like him. Thank you for killing my lover. I was the bride of the revolution because of you. And because of you I became a widow," Safadi wrote on Facebook, in a post seemingly directed at the Syrian government.
CNN has not independently confirmed Khartabil's death.
"We are deeply saddened and outraged at this awful news. Bassel Khartabil will always be remembered as a symbol of courage, who peacefully fought for freedom to the very end. Our thoughts are with his family," Anna Neistat, Amnesty International's senior director of research, said in a statement Wednesday.
Khartabil 'opened up the internet in Syria'
Khartabil, also known as Bassel Safadi, was a Syrian-Palestinian who was widely seen as the person who brought open-source software to Syria, helping Syrians evade regime surveillance and online censorship.
Foreign Policy magazine ranked the activist as the 19th most influential thinker in 2012 for "insisting, against all odds, on a peaceful Syrian revolution."
Khartabil was arrested in Damascus in March 2012. A year after his arrest, two members of the Europea