A grim-faced Panneerselvam, who was also seen sporting a beard, was sworn in around 1.15 AM by Governor Ch Vidyasagar Rao at the Raj Bhavan amidst a scene of gloom.
After he took oath of office, a total of 31 Ministers, all of them members of the previous Jayalalithaa cabinet, took oath in a simultaneous swearing-in.
Panneerselvam was administered the oath of office and secrecy by Rao, who air-dashed here from Mumbai yesterday after Jayalalithaa suffered a cardiac arrest.
This is the third time he is helming the state, acting as a stop-gap arrangement on earlier both occasions when Jayalalithaa was convicted in two separate corruption cases in 2003 and 2014.
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Later, the Raj Bhavan in a release said that
Panneerselvam, MLA from Bodinayakanur, met the Governor and submitted a letter informing him of his election as leader of the AIADMK Legislature Party.
Panneerselvam took oath as CM with a photo of Jayalalithaa in his pocket.
The Governor "appointed him as the Chief Minister of Tamil Nadu and invited him to form the government," it added.
As Chief Minister, Panneerselvam will hold all portfolios held by Jayalalithaa including Home, besides Finance.
Panneerselvam retained all members of the Jayalalithaa cabinet.