KANPUR, June 3 -- A married couple has been arrested for the murder and dismemberment of a 20-year-old man after investigators found a meticulous digital trail on their smartphones, including YouTube queries on how to evade capital punishment, dispose of a corpse, survive a police encounter, and even prison amenities, police said on Tuesday. The victim, Vijay Nishad, had been missing from Fatehpur district since May 8. His family lodged a missing person's complaint on May 11. During analysis of his call detail records, Bakewar police noticed unusually high call volume between Nishad and a woman named Kiran Devi, a resident of neighbouring Hamirpur. When the couple - Kiran and her husband Kamta Prasad Nishad - were picked up for questioning, sharp inconsistencies emerged in their accounts, police said. A forensic examination of their mobile phones then revealed the incriminating search history, which became the central pivot in solving the disappearance. According to SP, Fatehpur, Abhimanyu Manglik, the homicide was rooted in an extramarital affair between the victim and Kiran Devi. "On May 8, Kiran lured Vijay to her house where Kamta bludgeoned him with a wooden door frame," Manglik said. " They then used a grinder machine to sever the limbs, packed the remains into a sack, and drove to a forest area in Kanpur's Reuna where they incinerated the body using petrol to erase all clues." Police said Vijay allegedly uploaded compromising photographs of Kiran on social media after a dispute, prompting her husband Kamta to return from Gujarat and allegedly plot his murder with her. However, Vijay's family claimed a larger group was involved, citing eyewitness argued that Kiran is pregnant and Kamta walks with an iron rod in his leg, making it unlikely that the couple alone could have dismembered, transported and disposed of the body. Police have registered a murder case....