India, Feb. 25 -- LUCKNOW Four days after the shocking murder and dismemberment of a 49-year-old businessman inside his upscale Ashiana home, investigators are shifting their focus to the exact psychological flashpoint that drove his 21-year-old son to allegedly commit the crime. On Tuesday, police escorted the accused back to the residence to reconstruct the scene, seeking to identify the precise "trigger moment" that escalated a simmering domestic dispute into a fatal shooting.

The accused, identified as BBA student Akshat Singh, allegedly shot his father, Manvendra Singh, a liquor businessman and pathology lab owner, using a licensed rifle in the early hours of February 20. According to authorities, Singh then dismembered the victim's...