The appellants, including V Arjunan, former CPI district secretary, his son Suresh and five others, submitted that the prosecution case "is full of contradictions, artificial and unbelievable."
The Deputy Superintendent of Police, CB-CID, the Investigating Officer in the case, had filed the case against 21 persons, of whom 11 were convicted and sentenced, while 10 others were acquitted.
They alleged some persons were 'fixed' in the case due to animosity and the probe was transferred only to stall the original investigating agency to find out the real culprits.
The prosecution had suprisingly dropped 15 members on the ground that the prime witness had agreed they were falsely implicated. The lower court had relied on motive (previous enemity due to election dispute), but there was no admissible or corroborating evidence to prove it, they said.
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Besides, the medical evidence of one of the injured showed it was only an accident and not murder, they claimed.
An armed gang had waylaid their SUV at Oochaikulam near Nedunkulam and attacked them with deadly weapons.
CID, which took up the probe, concluded that Arjunan (60), his son and his associates had committed the murders. It said there was 'misunderstanding' between Kathiresan and Arjunan over the president election to Periyakannanur panchayat.
The agency had filed the charge sheet against Arjunan and 20 others on January 30, 2013.
The district court, which had conducted the trial, convicted them last month and sentenced each of them to triple life sentence. It also slapped a fine of Rs 3,000 on each of them, a CB-CID release said.