The condition of CPI(M) MLA Susanta Ghosh, arrested in connection with a nine-year-old murder case, has been stated to be stable and he may be released from hospital on Tuesday.
On Saturday during interrogation, Ghosh, 52, complained of illness and was taken to the SSKM hospital, where he has been kept under close observation.
SSKM hospital sources said the medical board found his condition stable, but would consider his release on Tuesday.
Seven skeletons have been exhumed from behind his house in West Midnapore, and this aroused the suspicion that Ghosh, a minister in the governments of the late Jyoti Basu and Buddhadeb Bhattacharjee, was involved in the murder of seven Trinamool activists in 2002.
Meanwhile, Criminal Investigation Department (CID) sleuths arrested four more accused in the murder case.
The CID arrested Ghosh on August 9 after the chief judicial magistrate (West Midnapore) rejected his anticipatory bail application.
Earlier, FIRs were filed against the former minister as well as the four others on June 4 at the Anandpur police station after missing Trinamool Congress worker Ajoy Acharya's son claimed he had recognised his father from the clothes found on one of the skeletons.
Acharya's son alleged his father was among seven Trinamool Congress workers abducted by CPI(M) workers in 2002. The seven have been missing since then.
On the other hand, the CID has initiated fresh cases against Ghosh and his brother Prasanta. The sleuths recovered a wireless transmitter from the house of Susanta Ghosh and bullets from his brother's room on Saturday.
CID deputy inspector general (operations) K Jayaraman said: "We have initiated a fresh case against Ghosh for keeping and using a powerful wireless transmitter without permission."
(With inputs from HT Kolkata)