Yusuf, 87, was rushed to Bangabandhu Sheikh Mujib Medical University hospital this morning after he fell ill in his prison cell at Gazipur's Kashimpur Jail, Dhaka Central Jail Senior Supervisor Farman Ali said.
He died soon after he was admitted to hospital, Ali said.
Yusuf, accused of heading the infamous auxiliary force Razakar Bahini that targeted Hindus and Bengali nationalists during the 1971 liberation war, died of cardiac arrest.
"The Jamaat leader died of cardiac arrest," BSMMU director A M Bhuiyan was quoted as saying by the bdnews24.Com.
The tribunal was set up in 2010 to investigate abuses committed during the 1971 war.
His defence team had argued that Yusuf should be granted bail immediately because of his old age.
Defence counsel Tajul Islam alleged the jail authorities brought Yusuf to the BSMMU around 10:15 am (local time) but not given proper primary treatment there.
Denying the allegation, BSMMU Director Brig Gen (retd) Abdul Majid Bhuiyan told reporters that Yusuf was whisked off to the hospital in critical condition around 11:00 am and doctors tried their best to save him.
Yusuf might have died of cardiac arrest but reason behind his death can only be ascertained after his autopsy, he said.
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