The India Meteorological Department had earlier predicted heavy rains in the region.
One of them, however, succeeded in swimming back to the river bank and informed the villagers about the incident.
E Perumal (45) was a native of Marugampatti in Dharmapuri's Pennagram Taluk. For the past five years, he had been residing in Namakkal's Pallipalayam, where he owned a fruit shop.
According to locals, 19-year-old V Siddhartha and 20-year-old B Madan Kumar drowned when they were swimming in the canal.
The forensic report calls the death accidental; mortal remains of Sridevi stuck in UAE due to legal procedures.