CHENNAI: A 36-year-old man murdered his four-month pregnant wife by setting her on fire following a domestic quarrel at Maraimalai Nagar in Kancheepuram district on Thursday night.Police said Rajkumar and Nandini, 28, got married seven years ago in Manali. The couple has a six-year-old son and Nandhini was four months pregnant now. Rajkumar was jobless and was staying in Govindapuram near Maraimalai...