Speaking to IANS, a police officer in Bodinayakkanur in Theni district said: "Manikandan had returned from Sri Lanka. He was home-quarantined. But on Friday, he ran out naked and bit the throat of an aged woman lady living two streets away."
Manikandan had returned a week before to his native and was home quarantined.
Police said Manikandan was taken to the government hospital and was tested for coronavirus infection and doctors are also looking at his mental stability.
The police officer said there was no previous enmity between Manikandan's family and that of the old woman.
The police has registered a case and investigations are on.