The 26-year-old Manoj, running a two-wheeler workshop in Sulur on the outskirts, had gone on night duty as a volunteer of "Friends of Police" on January 19 and did not return home, police said.
His wife lodged a complaint with police and also with "friends of police.'
Police recovered his motorcycle near the PAP Canal at Sulthanpet in the district and alerted nearby police stations.
A body from the canal was recovered near Pongalur, some 20 km from Sultanpet, and was identified by the wife, they said.