"Freedom at last. Hope they give him to his family. We all tried, guess not hard enough. May god give his family strength and his soul rests in peace," Salman posted on Twitter.
Last year, Salman had urged his fans and the public to join an online petition that he planned to give to the Pakistan government in a bid to free Sarabjit.
Sarabjit Singh, on death row in Pakistan after being convicted for terror strikes in the country, had been comatose since April 26, when he was savagely attacked by two fellow prisoners at Lahore's Kot Lakhpat Jail. He had spent over 20 years in jail.
Sarabjit Singh died early Thursday in a Lahore hospital.
Intent not important in charity
Bollywood superstar Salman Khan feels people should engage themselves in charity irrespective of the reasons for it
"Everybody in the industry does charity. Some people talk about it and some people don't. They say intent is important in charity, I don't believe it.
Even if someone is doing charity to show off, I have no problems with it. One should just do charity for whatever reasons they want, " Salman said. The 47-year-old actor's NGO Being Human has joined hands with Fortis foundation to unveil the Little Hearts programme to provide care to children with congenital heart defects.
Salman also opened his merchandise store in the hospital here. "I think if you have money, you should use it to save life. I feel what we are doing is just a drop in the ocean, " he added.
The 'Dabangg' star, who is fondly called 'Sallu Bhai', said that he does not like when ladies call him 'bhai'. "I have four sisters and two of them are rakhi sisters .
They are enough for me. I cannot handle people calling me 'bhai'. In fact I don't know how to react when a girl calls me 'bhai', " Salman said.
When asked about the secret of his fit and fabulous body even at this age, the actor said, "My father says after 30 years a man is responsible for his own looks. So, if you are a frustrated person then it will show on your face. "