45-year-old Dey was released from a home for the mentally ill a couple of months back and was staying alone at a flat here since then.
Dey probably committed suicide and his body was found inside the bathroom of the flat on Watgunge Street where he had been living for the past few months, according to a senior officer of Koklata Police.
"When we reached the flat after receiving a complaint from neighbours this noon we found Dey's half burnt body lying inside the bathroom. He was dead. Probably he used the petrol to commit suicide... But it's still not confirmed. We are waiting for the postmortem report," the officer told PTI.
The police had stumbled on the skeletons of Dey's elder sister and remains of the two dogs on June 10, 2015 night while investigating the death of Dey's father Arabinda De.
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Arabinda's body was recovered from the bathroom of his residence in Robinson Street after police got a call about a fire.
Dey underwent treatment at the Pavlov Hospital for the mentally ill.He was released from the hospital after they found him "fit", police said.