A month after a Tamil Nadu minister was raided in Chennai, and documents showed crores were allegedly paid as bribes for voters, the minister's aide has been found dead. R Subramaniam, 58, collapsed yesterday when he was visiting his farm in Namakkal, 350 kilometres from Chennai. Police sources said that they are waiting on a post-mortem report to determine how he died, but suspect that he drank poison because of the stress caused by his interrogation by tax officials.