THENI: Police have arrested three person in connection with the death of SSI after an altercation with a group of youngsters while returning home after duty on Sunday.Police sources said Senthil Kumar, A special sub-inspector (SSI) attached to the Theni DSP office, who was returning to his home after duty and dressed in plain clothes.He noticed a group of youngsters bursting crackers on a public road, causing inconvenience to the public. He reportedly advised them to clear the road and attempted to video-record the activity on his mobile phone.When he tried to apprehend one of the youngsters, an individual allegedly struck him with an elbow during the ensuing scuffle, causing the officer to collapse on the spot.A police patrol team that arrived at the scene immediately rushed Senthil Kumar to a hospital for treatment. However, he later succumbed.Sources said the SSI had a history of heart-related ailments, and police are investigating the cause of his death.The exact cause of death will be ascertained following the post-mortem examination and further investigation.K S Praveen Gowtham, Superintendent of Police, Theni district, visited the scene and reviewed the inquiry.Police have arrested three persons from the locality in connection with the incident and are continuing further investigation.