Calcutta, April 23 :    Calcutta, April 23:  Nine hours after dentist Surya Chakraborty was killed at his CIT Road residence on Sunday, police arrested and charged two of his teenaged chamber attendants with 'premeditated murder'. Detective chief Banibrata Basu said the first arrest was carried out early on Monday when Chitto Ranjan Kallai, 15, confessed to the crime. Kallai also handed over the murder weapon, a blood-stained block of wood used to bolt a door, to the investigators. Based on Kallai's testimony and a reconstruction of the crime, the sleuths arrested Ramesh Majumdar, 16, the other attendant who is believed to have planned the murder. Kallai was produced before the Sealdah court and remanded in police custody till May 5. Kallai, hailing from Orissa, had been living with the Chakrabortys for the past three years. The cops aren't too convinced about the motive given by the duo - the fact that the dentist had asked Kanak Majumder, Ramesh's brother, to stop supplying medical equipment to the chamber. What has complicated matters further is the fact that there was a feud between the 42-year-old dentist and other owners in the housing complex who wanted him to vacate. According to Kallai, Kanak had apparently been supplying the stuff for the past 10 years. But recently, Chakraborty had hauled him up for 'the poor quality' and shown him the door. When Kanak and Ramesh claimed their dues of Rs 4,000, the doctor had refused to pay up. That's when Ramesh decided to kill Chakraborty. On Monday, at the CIT Road chamber of Surya Chakraborty, Kallai gave the sleuths a graphic account of the murder: 'Around 4.30 pm, I shut the windows of the chamber. The doctor was counting out his money when Ramesh hit him on the head with the block of wood... As the doctor slumped to the floor, Ramesh bolted the door from inside and instructed me to hit the doctor again. He then placed the wood on the doctor's throat and stamped on it. Ramesh left the chamber and I ran up to the fourth floor to inform the others.'