Yusuf Memon, a 1993 Mumbai serial blasts case convict and a brother of absconding accused Tiger Memon, died on Friday at Nashik Road Prison in Maharashtra's Nashik district, a prison official said.
The cause of death was yet to ascertained and the body would be sent to Dhule for autopsy, he said.
Nashik police commissioner Vishwas Nangre-Patil confirmed Memon's death.
While Tiger Memon was allegedly the mastermind of the blasts conspiracy along with fugitive gangster Dawood Ibrahim, Yusuf was accused of allowing his flat and garage at Al- Husseini building in Mumbai for terrorist activities.
A special TADA court had