Answer:
so first of all, the case never ended
As, we know that there was age-old enmity between Pandey and thapa in that time. it is Myth till today that who is murderer of Devendra. Bhimsen was very tortured by sending him to prison every month by Pandeys. He was so mistreated that no one respect him as ex- prime minister at any where i.e. palace,kingdom. He decided to go borlang,gorkha "his birthplace" and even Pandays arrested him form gorkha . At last Bhimsen was very stressed and kill himself in prison. The case was not re-investigate . So,. on one know who is the murderer of Devendra