 Complete the following phrase:  Roy was also part of the investigations into the serial murders committed by police informer Vijay Palande alias Karan Sood, Simrin Sud or Simrin Sood; the family murders involving actress Laila Khan; and the murder of lawyer Pallavi Purkhayasta. Hours after Roys death, the murder case of Meenakshi Thapa that he supervised, resulted in convictions. He was also involved in the Khairlanji Massacre case and post- 