The incident took place on Sunday at Khoprahiya village.
A group of people accused Dular Rai (55) of stealing the vegetable from a field and beat him up mercilessly, Sitamarhi Sadar SDPO Veer Chirendra Kumar said.
A grievously-injured Rai was taken to a health centre, where he was declared brought dead, the officer said.
Following a complaint by his family, an FIR has been registered. Investigation is underway and efforts are on to identify the accused, the SDPO said.
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