Dalbir Kaur, the sister of Sarabjit Singh, on Sunday joined the Bharatiya Janata Party (BJP).
Dalbir was earlier associated with the Congress and Shiromani Akali Dal (SAD).
Sarabjit, who was sentenced to death by a court in Pakistan, died while in jail after being attacked by his inmates.
Dalbir campaigned fiercely for her brother's release. While his death sentence was postponed, he was not released from jail.
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