Vijay Kumar Mishra, son and senior leader of JD(U), said the case has been delayed "extraordinarily".
He also questioned investigation by the CBI in the murder case in a bomb blast at a function at Samastipur Railway Station on January 2, 1975.
"Everybody knows how CBI works. The Supreme Court has aptly described CBI (caged parrot)...I doubt role of the four in the case," Mishra, former MLA from Jale in Darbhanga district told PTI.
Former Bihar Chief Minister Jagannath Mishra also pointed to inordinate delay in judgement in the case.
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Jagannath Mishra who says he himself was injured in the attack, said "its a challenge to the system that justice comes fast in the killing case of a freedom fighter."
Jagannath Mishra, whose son Nitish Mishra is a minister in Jitan Ram Manjhi government, said he was curious to know the motive behind killing of Lalit Narayan Mishra, who was dedicated to the nation and worked tirelessly for development of Bihar.
Nearly 40 years after the then Railway Minister Lalit Narayan Mishra was killed in a blast in Samastipur station, a Delhi court today convicted three Ananda Margas and an advocate for conspiring and murdering him and two others.