"To conduct an inquiry and submit a report on the death of former Chief Minister J Jayalalithaa, an inquiry commission headed by retired high court judge, Justice Arumugasamy, has been constituted," according to an official release here.
A government order has been issued for this purpose, it said.
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On August 17, Chief Minister K Palaniswami had announced that a commission of inquiry would go into the death of Jayalalithaa.
The 68-year-old AIADMK supremo died following a cardiac arrest on December 5 after being in the hospital for 75 days.
A probe into Jayalalithaa's death was one of the demands made by the rebel leader and now Deputy Chief Minister O Panneerselvam for the formal merger of his faction with that of Palaniswami.
The two factions had merged on August 21.