Sargsyan went on hunger strike, and demanded that his preventive measure of arrest be commuted.
Several days ago, and with a written guarantee by several dozen MPs, he was released from prison and immediately taken to hospital.
A few days ago, he had left the hospital on his own volition. But had been hospitalized again, on Wednesday evening. He did not regain consciousness after his surgery.
The Sasna Tsrer armed group took over a police patrol regiment building in Yerevan, took hostages, but later surrendered, in July 2016.
On July 26, Artur Sargsyan had broken through a police wall with a vehicle loaded with food, and delivered food to members of this armed group.
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