The Supreme Court on Thursday imposed one-year rigorous imprisonment on former Punjab Congress president Navjot Singh Sidhu in a three-decade old assault case in which a person had died. On December 27, 1988, Sidhu had allegedly hit one Gurnam Singh on his head following an altercation, leading to his death. However, a bench of Justices A M Khanwilkar and S K Kaul rejected the plea for imposing culpable homicide not amounting murder charge under Section 304A of IPC on Sidhu.