Orre Ramaswamy from Karimnagar district in Andhra Pradesh had gone to the US about 30 years ago. His mother Mallavya has written to the Ministry of External Affairs about her plight.
According to Ms Mallavya, her son has not contacted her for the last nine years. She also said that unable to bear the shock, her husband Rajaiah died a couple of years ago.
Hailing from Morapalli village of Jagityal 'mandal' (block), Mr Ramaswamy visited his native village only thrice in three decades.
During his last visit, Mr Ramaswamy had reportedly shown the photograph of a woman from Chennai to his mother, stating that he was in love with her and was going to marry.
After doing his masters in science in 1971, Mr Ramaswamy worked as scientist in various organisations at Chennai, Bangalore and Delhi.
The scientist's address in the US and other details were not available with the mother.