Zaw Myat Linn, an official from deposed Myanmar leader Aung San Suu Kyi’s National League for Democracy has died in custody after he was arrested early on Tuesday.
50 protesters have died since protests started in early February in resistance to the military coup that ousted the elected government of Ms Suu KI.
Zaw Myat Linn is the second party figure to die in detention in two days.