Who is responsible for Sarabjit's death?

Sarabjit Singh (1963/1964 – May 2, 2013) was an Indian national who claimed to be a victim of mistaken identity and was convicted for his alleged role in the bomb attacks that killed 14 people in Lahore and Faisalabad in 1990. Sarabjit was a farmer who claims he strayed into Pakistan from his village located on the border, three months after the bombings.He was sentenced to death in 1991, but his hanging had been repeatedly postponed by Pakistani courts. Five mercy petitions were filed on his behalf, in which he maintained that he served twenty-two years of prison term for a crime he had not committed. A few weeks earlier he was attacked by some terrorists in the prison. He died on 2/May/13 due to serious injuries. Who is to be held responsible for such a merciless death? Media person are blaming the government of India but what they had done? They tried hard but couldn't succeed. I think so Pakistan is to be held responsible for that death.