Jamshedpur: Imported chocolate laced with poison killed six-year-old Akshak and his mother Munni Singh (35) at their Vijaya Gardens home in Baridih, police suspect.

More chocolate found on a table beside the bodies of the murdered mother-son duo in Flat 2124 of Sunflower block in the elite residential colony are being sent to Ranchi for forensic examination along with their viscera samples.

Police plan to send the viscera of businessman Nishant Kumar Singh (40) for forensic tests too to ascertain if he ate chocolate before hanging himself after poisoning his wife and son over unpaid loans.

"Although the autopsy report is pending, we have evidence to confirm that Nishant committed suicide after the murders. He gave his wife and son chocolate laced with poison," said Birsanagar thana OC Upendra Narayan Singh.

"We have seized the imported chocolate for forensic tests. Lab examination of viscera samples will help us ascertain what kind of poison was used. The businessman's viscera will be sent to Ranchi as well," the officer added.

At Vijaya Gardens, Akshak was missed the most on Wednesday as hearses carried the flower-decked bodies of the young couple and their son to Subernarekha burning ghat.

Septuagenarian Vijay Singh, also a resident of Sunflower block, said he had a tough time keeping his grandchildren indoors during the funeral procession.

"Since Tuesday afternoon, I had kept my grandchildren - especially grandson Rishab (7), a playmate of Akshak - confined to a room. They were asking too many questions to which I had no answers. Rishab was told Akshak is unwell and has been admitted to hospital when the child didn't come out to ride bicycle in the evening. But then, Rishab and Ananya saw the hearses today (Wednesday). They know something is not right," the elderly man said.

Abhijit Nandi, a resident of Iris block opposite Sunflower block, echoed Singh.

"My son Neel is seven. Akshak and he played cricket every day. In fact, they had played on Monday evening too. And now, my son is asking about Akshak all day. He fondly calls him Akki," said Nandi, a Tata Steel employee.

Nandi remembered Akshak's father Nishant as a very social person. "We residents organise get-togethers as many as eight times a year. Starting from New Year to Durga Puja and other festivals. Nishant and his wife were always happy to help in preparations. The family never missed a get-together," Nandi added.