Chennithala, however, shot back asking Vijayan as to why he was getting upset for referring the case to the CBI.
Talking to reporters in Kannur, Vijayan said the Congress and the RSS were in hand-in-gloves as far as the Manoj case was concerned and that was why the UDF Government referred the case to the CBI under pressure from the RSS and the BJP leadership.
Hitting back at Vijayan, Chennithala said he was at a loss to know the cause of the CPI(M) leader's worry over the CBI probe into the murder.
"Is it that he is afraid of the outcome of such an investigation. Raising objections to a thorough probe in a murder case is difficult to understand", Chennithala said in Pathanamthitta.
Manoj, a district functionary of the RSS, was waylaid and hacked to death on September 1 at politically sensitive Kathirur by a group of assailants, allegedly comprising CPI(M) workers and sympathisers.