Pakistan's President Pervez Musharraf has rejected a mercy petition by an Indian man to have his death sentence for spying overturned, reports say.
Swapandeep Kaur with a photo of her father, Sarabjit Singh
Manjit Singh was convicted of spying and carrying out four bombings which killed 14 people in Pakistan in 1990.
His family say he is Sarabjit Singh, a poor farmer who strayed from his border village into Pakistan and is a victim of mistaken identity.
Pakistani officials say he was arrested while trying to slip back into India.
The President's rejection of the mercy petition came a day after another Indian man, sentenced to death in Pakistan for spying in 1973, reunited with his family in India after being released on Monday.
'Fight till my last breath'
India and Pakistan have jailed hundreds of each other's soldiers and civilians during times of hostility.
Two years ago, Pakistan's Supreme Court rejected Sarabjit Singh's attempt to have his death sentence for spying overturned.
Dalbir Kaur, his eldest sister, said her brother was innocent.
She told the Press Trust Of India news agency that she would "fight till my last breath to save my brother's life".
"We must keep fighting for his release. The government must help us," she said.
Singh was sentenced to death on four counts in 1991 for each of the four bombings, which took place in the cities of Lahore and Faisalabad.
The case received wide publicity in India and the government has come under tremendous political pressure to intervene.
In 2005, former Indian foreign minister Natwar Singh asked for Singh to be pardoned on humanitarian grounds.