Singh, who is in the intensive care unit of Pakistan's Jinnah Hospital, is in a critical condition.

BBC: Sarabjit Singh: Family of Indian 'spy' back from Pakistan

Sarabjit Singh is in the intensive care unit of the state-run Jinnah Hospital.

BBC: News - Sarabjit Singh: Indian prisoner's condition 'deteriorates' in Pakistan

Sarabjit Singh was attacked Friday and had been comatose and on a ventilator for days before he died early Thursday at Jinnah Hospital in the eastern city of Lahore, according to a Pakistani foreign office statement in Islamabad.

NPR: Indians Angry At Convicted Spy's Death In Pakistan