"Sarabjit Singh was killed in the same jail where our father was murdered. The same persons who killed Sarabjit were involved in the killing of my father," alleged Chamel Singh's son, Deepak.
"We appeal to the Centre that our father should also be accorded the title of a martyr," Deepak told PTI.
Chamel Singh, who hailed from a border village of Pargwal in Akhnoor of Jammu, was beaten to death in Pakistan's Kot Lakhpat jail on January 15 this year and his body was brought back here on March 13.
Chamel Singh, who was about to complete a five-year prison term for his alleged involvement in an espionage case, died in Lahore with reports saying that he was "mercilessly beaten" by Pakistani prison staff.