Palestinian and Israeli authorities on Tuesday reported the death of a prominent leader of the Palestinian Islamic Jihad movement (PIJ), Khader Adnan, who embarked on a hunger strike for 86 days.

The Palestinian Prisoners’ Club Association, a non-governmental organization, said in a press statement that Adnan died in Israeli prison.

According to the association, that was Adnan’s sixth hunger strike in Israeli prisons, where he had previously survived five to protest his arrest and administrative detention without trial.

His last hunger strike began on Feb. 5 after an Israeli army force stormed his house in Arraba, south of the northern West Bank city of Jenin, and arrested him for the sixth time.

The Israeli Prison Service said in a statement that Adnan, 45 years old, was found unconscious in his cell in Nitzan prison.”

“A medical staff tried to resuscitate his heart before he was transferred to Assaf Harofeh Hospital, where his death was confirmed,” said the statement.

It added that “Adnan refused to undergo medical examinations and receive treatment during his hunger strike.”

Meanwhile, a member of the PIJ Political Bureau in Gaza, Muhammad Al-Hindi, said his movement mourned Adnan and condemned his death in Israeli prisons.

“We hold the enemy responsible for the crime of assassinating Sheikh Adnan, and the enemy will pay the price for this crime,” said Al-Hindi.

According to the Palestinian Prisoners’ Club Association, Adnan’s death brings the number of Palestinian prisoners who died in Israeli prisons to 237 since 1967, including 75 fatalities due to medical negligence.