Dalbir Kaur, 67, the sister of Sarabjit Singh who succumbed to injuries received in a beating by inmates in a Pakistan jail in 2013, died here on Sunday. According to her family, Kaur had complained of severe chest pain on Saturday night and was taken to a private hospital here where she died. Poonam, daughter of Sarabjit Singh, said that Dalbir was already suffering from lung infection for the past one year.