Chandigarh, Dec. 9 -- Over four years after his wife was found murdered inside their house on the Panjab University campus in Sector 14 in November 2021, police on Monday arrested professor BB Goyal, the man they had suspected all along. Brain-mapping results, investigators said, finally confirmed their longstanding theory that the killing was committed by someone inside the house, and Goyal was the only person present through the night. Senior officers said the Brain Electrical Oscillation Signature (BEOS) profiling test conducted at the National Forensic Sciences University, Rohini, revealed that Goyal's brain registered and responded to crime-specific details, indicating "experiential knowledge" of the murder. After more than three years with no physical evidence - no fingerprints, no DNA, no weapon and no foreign trace material - police had turned to neuro-psychological forensics, a rare and controversial route in the Indian legal system. Police have now sought a three-day remand to confront the accused with the findings. On the morning of November 4, 2021, the Diwali day that year, the professor's wife, Seema Goyal, 60, a homemaker, was found dead in the ground-floor bedroom of the couple's official accommodation on PU's north campus. Goyal had claimed to have found her lying on the bed, with hands and legs tied with a cloth. The body had already been moved to GMSH, Sector 16, before police were alerted. The couple's only daughter, Parul, had been away at a friend's house since the previous day. Police had recorded both Goyal's and Parul's statements by November 7. Even as the investigation dragged on, Goyal continued teaching at the University Business School (UBS). Five months after his wife's murder, he was appointed as the UBS chairperson. Colleagues said the professor, now 63 years old, had been with PU for nearly three decades and is currently working on extension after retirement. PU registrar YP Verma confirmed that Goyal will be suspended within 48 hours of his arrest....