Imphal, (Manipur), [India], Jan. 20 (ANI): Imphal Court on Friday sentenced N. Ajay Singh, son of Bharatiya Janata Party (BJP) leader N. Biren Singh, to five years in prison and levied Rs 50, 000 fine for a culpable homicide in a 2011 firing incident in which Irom Roger, 21, was killed.