A week after the death of Rohit Shekhar Tiwari, the son of former Uttar Pradesh Chief Minister ND Tiwari, his wife Apoorva Shukla Tiwari was arrested and taken away by the police from their south Delhi home. Apoorva strangled her husband and choked him with a pillow after a huge fight, the police said today. She was later sent to two-day police custody. Apoorva, a lawyer, was questioned for three days as the police investigated the mysterious death of 40-year-old Rohit Shekhar on April 16. He was earlier believed to have died of a cardiac arrest.