Chandigarh, Dec. 13 -- Days after UT police arrested Panjab University (PU) professor BB Goyal for his wife's murder, their daughter joined the investigation and indicated to cops that her parents had been going through a "strained relationship" in the period leading up to the crime. Seema Goyal, 60, was found dead in the couple's house on PU campus, Sector 14, on November 4, 2021. Their only daughter, Parul, had been away at a friend's house since the day before. During questioning, the daughter, now 30, confirmed that frequent disagreements had become common between the couple before the murder, police sources confirmed. On the night of the murder, she had gone out to celebrate with her friends as she had cleared her NEET exam. When she returned the next morning, she learned of her mother's death. In his earlier statement to the police, prof Goyal had recounted that she confronted him in shock and anger, grabbing him by the collar and saying, "You killed my mother." Prof Goyal was arrested earlier this week after his brain-mapping test confirmed the long-standing police theory that the killing was committed by someone inside the house. Goyal was the only person present there on the night of murder....