Sessions judge of Howrah Court Tanmay Gupta held the 12 guilty of murdering Pal on July 2, 2004. The quantum of punishment will be announced tomorrow.
Among the convicted persons was a local CPI-M leader Biswajyoti Bose who was later expelled from the party. He owned the nursing home in Bally where the murder took place.
Other convicts included Dr Piyali Das, Shubhanarayan Ghosh, Amit Banerjee and Prahlad Sarkar.
Dr Pal, a gynaecologist at the Serampur Walsh Hospital in Hooghly district, was killed in the nursing home in Bally in Howrah district and his body was found from the bank of the Saraswati river in Sankrail.
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Dr Pal went missing after leaving his residence on Karaya Road in Kolkata for his workplace at the Walsh Hospital on the fateful day. His body was recovered next day from the riverside in Howrah district.
One of the accused committed suicide during the trial.