A Sub-Inspector of Police, who was riding the two-wheeler, and the 'burglar', riding pillion, were seriously injured when a speeding unidentified four-wheeler hit the two-wheeler from behind at Kazhiyappanallur, they said.
Head constable Ilangovan was killed on the spot.
SI Subramanian and the accused had been admitted to government hospitals in Thanjavur and Mayiladuthurai respectively, police said.
Ilangovan and Subramanian had gone to Singanodai village near Porayar, about 35 km from here, after being informed that a burglar had been caught red handed by locals.
Police said a special team had been formed to identify the vehicle that caused the accident.
Nagapattinam District Superintendent of Police Deshmukh Shekar Sanjay placed a wreath on the body of the head constable.
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