Dr. K. I Singh and Ram Prasad Rai were assassinate by Nepali Congress Party of B.P. Koirala. I do not think Dr. K. I. Singh was assassinate he died of natural cause. To my knowledge later he joined his hand in Panchayat and got elected for Rastriya Panchayt Sadasya from Rupendhi district. Not only that he was even choosen for Primeirship but passed away the day it was supposed to be announced.(My Broda and his friends talk about him fondly, how he get rid of those bandits from Marchawar, Lumbini area) As for Ram Prasad Rai its little bit merky. Nobody knows what really happen. However, Once my far related granpa, who helped mukti morcha with ammunation he talked about him but i cannot remember all of it. May be need to ask him about it.