Deo Kumar Singh was born in Sukulchak village in the Jehanabad district of Bihar, the eldest child of a middle-class family. His father, Ram Narayan Singh was a government servant and mother Ajnaso Devi was a housewife. Singh had done schooling from Jehanabad and Patna districts in Bihar. He graduated in science from College of Commerce, Arts and Science, Patna. He then married Prabhawati Devi and shortly afterwards moved to Dehri on Sone, where he started a small food business.
Singh was one of the most wanted persons by the Indian government and nine states of India including Jharkhand, Bihar, Maharashtra and Chhattisgarh. Jharkhand government alone had announced an award of 10,000,000 for any information leading to his arrest. He was known as the mass organiser and backbone to set up and strategise guerrilla warfare under People's Liberation Guerrilla Army in Indian forests against the imperialist state. He had proposed a new Strategy & Tactics, Critic Document, to central organising committee of CPI Party Unity which was accepted as a parallel thought of party line and played a key role in formation of Communist Party of India by unification of several left parties distributed across the country fighting for the same goal.
Life in prison
Singh was arrested for the first time in 1990 by Bihar Police and kept as a political prisoner in Bankipur Central Jail, Patna. After 3 years, he was released on bail. On 12 June 2003, he was again arrested in Patna by Special Task Force and was held as a political prisoner in Beur Central Jail, Patna, Jehanabad Jail and Bhagalpur Central Jail for more than 2 years. He mobilised the inmates and went on hunger strike several times against the corruption involved in Indian prisons and to fulfill the basic demands of innocent prisoners.
Personal life
Singh was affable and courteous with his mates and a charismatic person. After massacre of Arwal by police and the state ban on Mazdoor Kisan Sangram Samiti, Singh went underground; he addressed some press conferences and gave only a few interviews, which include those with Alex Perry of Time Magazine and Ushinor Majumdar, a journalist from Tehelka..
Death
On 21 March 2018, after two months of severe illness, Singh died of respiratory arrest and heart attack at Burha Pahar, Latehar, Jharkhand. Indian government and Paramilitary forces of India wanted to see his body as an evidence of death but failed to recover, they detained his family members and did not allow them to attend the last rites. His body was cremated in Latehar forest in Jharkhand under the security fence of communist guerrillas surrounded by local people and sympathisers.
Monument
After his death, people has planned to put up a bust made of granite stone and a 24 feet high concrete pillar on a 0.4 acre land at his native village Sukulchak. The process is currently underway by voluntary contribution involving physical effort and financial support from the people.