Nilgiris District Superintendent of Police Murali Rambha interrogated Sayan alias Shyam at a private hospital here, where he has been undergoing treatment since April 29.
He was wanted in connection with the break-in and killing of a security guard at the Kodanadu estate bungalow of late Chief Minister J Jayalalithaa.
Rambha said the health condition of Sayan was stable. However, considering that he may develop unnecessary stress, he was questioned only for a few minutes, the SP told reporters.
Sayan, who was driving the car, had rammed the vehicle into a stationary truck.
Kanagaraj was killed in a road accident in Salem on the same day.
Sayan had reportedly told police that the accident involving his family occurred as he was deprived of sleep in the previous days.
Meanwhile, as part of the investigations into the case, the Kodanadu estate workers and villagers in Kotagiri were also being questioned, police said.
Five persons have been arrested so far in connection with the case.
The gang members had planned the dacoity based on Kanakaraj's information that there was a huge amount of cash in the bungalow, police said.
The Kodanadu estate figures in a disproportionate assets case involving jailed AIADMK general secretary V K Sasikala and late Jayalalithaa, among others.
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