NEW DELHI: “It happened by mistake,” was the reason the 21-year-old son gave behind the gruesome act of allegedly shooting and chopping off his father’s body after a heated argument.Akshat, the BCom student from Lucknow, when asked about his side of the story, only had these four words to utter, “Galti se ho gaya.”The 21-year-old man from Lucknow was being pressured by his father to crack the National Eligibility Cum Entrance Test (NEET) examination. In a heated moment, the man took his father’s licensed rifle and shot him dead on the spot. His sister was also there at the residence, to whom the man had threatened to keep quiet.The case came to light a few days after the accused himself filed a missing person complaint for his 49-year-old father on February 20. Investigators say the complaint was part of an effort to deflect suspicion.Investigators claim the accused then dragged the body from the third floor of the house to the ground floor, where he dismembered it. Some body parts were reportedly transported in his car and dumped in Sadrauna, while the torso was concealed inside a plastic drum at the residence. The head is yet to be recovered.On Monday evening, police raided the house with the accused in custody and recovered the drum containing mutilated remains.Forensic teams have since been examining bloodstains found in the house and the vehicle. Search operations continue in Sadrauna to locate the missing body parts and reconstruct the sequence of events.“He was in the process of getting rid of the body part when we intervened,” a police source said, adding that sustained interrogation exposed contradictions in his account.Deputy Commissioner of Police (Central Zone) Vikrant Vir confirmed that strict questioning led to the breakthrough in the case. Authorities are continuing forensic analysis and witness examination as the investigation progresses.