Mustafa Çelikbilek, a purge-victim Turkish engineer, died of brain cancer on Tuesday, according to Ömer Faruk Gergerlioğlu, a human rights activist and a deputy of the Peoples’ Democratic Party (HDP).

Gergerlioğlu frequently brings up the plight of victims of the government crackdown.

In a message from his Twitter account on Tuesday, he wrote: “Another one! Mustafa Çelikbilek, a 35-year-old engineer who used to work at the Department of Information Technologies in Ankara, died today. Dismissed by a gov’t decree, he spent months in prison. The intensity of his sorrow triggered brain cancer. When he was released, it was too late.”

Gergerlioğlu did not mention exactly when Karakuş was jailed and what charges he is facing.

The Turkish government accuses the Gülen movement of masterminding a failed coup attempt on July 15, 2016 and labels it a “terrorist organization,” although the movement strongly denies involvement in the coup attempt or any terrorist activity.

Following the coup attempt, the Turkish government launched a massive crackdown on followers of the movement under the pretext of an anti-coup fight as a result of which more than 150,000 people were removed from state jobs while in excess of 50,000 others were jailed and some 600,000 people have been investigated on allegations of terrorism.

Since the coup attempt, there have been many cases of people who died in jail, some suspiciously, because they were denied crucial treatment or subjected to maltreatment or acts of torture.