Durga, a former JMM MLA, was 39. He is survived by wife and three daughters, family sources said.
They said Durga died due to kidney failure.
Durga was taken to the Bokara General Hospital after he complained of uneasiness. Doctors at the hospital declared him brought dead, Hospital director A K Singh said.
Durga, who contested and lost the Godda Lok Sabha seat, is the party's general secretary.
JMM president Shibu Soren, who was in Delhi at the time of his son's death, is rushing to Bokaro.
The director of the Bokaro General Hospital, Dr A. K. Singh, said Durga Soren was brought died.