Mohammad Ayyub Mev was admitted to V S Hospital after he was thrashed by unidentified persons on S G Highway on the night of September 13 after his car met with an accident.
A calf which he was allegedly carrying in the car died in the mishap.
Ayyub's brother Imran alleged that he was beaten up on the suspicion that he was transporting cows for slaughter.
"Ayyub's car met with an accident on SG Highway on the night of September 13. When some bystanders checked the car, they found a calf and a bullock. Due to the impact, the calf died while the bullock was rescued. To save himself from people's wrath, Ayyub started running," said inspector P B Rana of Anandnagar police station here.
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However, Ayyub's brother Imran alleged that assailants were cow vigilantes.
"Those who killed my brother were indeed gau rakshaks. My brother was not carrying any cow. Out of some grudge, these gau rakshaks mercilessly thrashed him. We want the police to nab the real culprits," said Imran.