The home minister assured the family members of Kirpal Singh of all possible help from the government, official sources said.
Kirpal Singh's sister Jagir Kaur was accompanied by Dalbir Kaur, sister of another Indian, Sarabjit Singh who had also died in a Pakistani jail in May 2013.
Sources said Jagir Kaur sought a probe into the death of 50-year-old Kirpal, who was languishing in a Lahore jail for nearly 25 years on spying charges.
Pakistan has said Kirpal had died following a heart attack at a jail in Lahore on April 11.
Kirpal had allegedly crossed over to Pakistan through Wagah border in 1992 and was arrested. He was sentenced to death in a serial bomb blasts case in Pakistan's Punjab province.
Kirpal, who hailed from Gurdaspur, was reportedly acquitted of charges related to bomb blasts by the Lahore High Court but his death sentence could not be commuted due to unknown reasons.
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