The Bolivian man, identified as Salomon Edgar Vaca Arambel, 49, was intercepted by the customs officials at the Delhi International Airport after his arrival from Addis Ababa on Thursday, official sources said.
When the officials could not find anything after searching him and his baggage, they took him before a designated magistrate to get permission to conduct a medical examination on him. The officials wanted to check if Mr Arambel had hidden any drugs in his body cavity, the sources said.
After getting the magistrate's nod, his medical examination was conducted at the RML hospital, where an x-ray of his chest and lower abdomen was done.
Nothing suspicious was found in the medical examination, the sources said.
The customs officials have informed the local police about the death, adding that an autopsy was conducted on the deceased and its report is currently awaited.
The incident comes two-days after a Delhi-based jeweller jumped to his death from the building of the Directorate of Revenue Intelligence (DRI), where he had gone in connection with alleged gold smuggling case.
He jumped off from sixth floor of the DRI office at CGO complex here on Wednesday, according to a statement issued by the probe agency.