The court handed down the sentence against Abdul Jabbar, a former lawmaker of the opposition Jatiyo Party, for his involvement in crimes against humanity.
He was convicted of mass killing, torture, torching of several hundred homes and forcible religious conversion of Hindus to Islam during the nine-month war, prosecution lawyer Zahid Imam said.
Jabbar was accused of leading the pro-Pakistani militia Razakar forces in his south-western home district of Pirozpur.
He said all the five charges against him were proved beyond doubt during the trial of Jabbar in absentia. Jabbar, who is in his early 70s, was a leader of Jatiya party of former president H M Ershad, who is a crucial ally of Prime Minister Sheikh Hasina’s ruling Awami League.
He was charged with carrying out massacres, arson, looting and force conversion of the people of Hindu faith siding with the Pakistani army. In 1986, he joined Jatiya Party and was elected an MP.