LUCKNOW, India — The investigation into the killing of ICICI Bank relationship manager Divya Mishra and the deaths of her husband Manas and his sister Sheeba is focusing on forensic evidence, the movement of Manas after the bank shooting and possible links to the supply of firearms. The probe is also examining the couple’s ongoing marital dispute and claims raised publicly by Divya’s elder sister and senior journalist Pragya Mishra.