Dube died Tuesday morning at his Makokoba home in Bulawayo.
According to Mbuso Fuzwayo Ibetshu Likazulu spokesperson, Dube died from injuries he sustained from police torture.
“Dube was arrested and tortured several times by police for leading protests against human rights abuse by the Zanu (PF) regime.
“ Early this year he spent several months in remand prison after police had also tortured him and he didn’t get treatment .We are sure this is what has caused his death although we are still waiting for postmortem results,” said Fuzwayo.
Dube and his Ibetshu Likazulu pressure group made headlines early this year when they led protests against the camping of North Korean soccer team world cup in Zimbabwe. They accused North Koreans to have trained 5th Brigade army which butchered Zapu supporters in the 1980s during an operation code named Gukurahundi.
The pressure group and political parties based in Matabeleland and the Midlands region had mobilized themselves ahead of the arrival of the North Korean team that was to set a train at Rufaro and Babourfieds stadiums before proceeding to South Africa for the FIFA 2010 Soccer World Cup.
The North Korean team ended up not coming to Zimbabwe.
Ibetshu LikaZulu has also been calling for President Robert Mugabe and those linked to the Gukurahundi massacres to be brought to the International Criminal Court of Justice for "their crimes against humanity.