Hossein Shanbehzadeh was tortured and had death threats issued against his niece during interrogations, an informed source said.
The Hezbollah member had details on the hospital's operations for several years, and there were fears that he leaked hospital data to Israeli intelligence.
INTERNAL SECURITY AFFAIRS: For a fistful of dollars, Israelis are ready to assist Iran in its war against Israel.
Among those targeted were senior officials in the defense establishment, political figures, journalists, academics, and media professionals.
Roi Mizrahi and Almog Attias, 25, from Nesher, were in contact with an Iranian spy handler who issued instructions, including to set up spy cameras, the indictment alleges.
They were the exceptions that proved the rule: Israelis don't work for the enemy.
Cohen, who was hanged in 1965 in a downtown Damascus square after infiltrating Syria's political elite, is still regarded as a hero in Israel.
Syria had kept the files in a highly secret and secure location and it took time for the Mossad to locate and plan to take the files even after the Assad regime collapsed.
The suspect had reportedly collected intelligence around the hospital where former Prime Minister Naftali Bennett was hospitalized.
Rumors of Saleh's arrest and prosecution circulated on social media. One news source claimed that the singer had been working with Israel for "several months."