A minor disagreement over switching off lights turned fatal at a digital vault and photo-editing firm in west Bengaluru’s Govindarajanagar early Saturday.

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Police said 41-year-old manager Bheemesh Babu, from Chitradurga, was bludgeoned to death with a dumbbell by his colleague Somala Vamshi (24), a technical executive from Andhra Pradesh.

The altercation reportedly began around 1 am when Babu, who was sensitive to bright lights, asked Vamshi to turn them off. The argument escalated, and in a fit of rage, Vamshi allegedly threw chilli powder at Babu before attacking him repeatedly with an iron dumbbell.

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Babu died on the spot. Vamshi later surrendered at the Govindarajanagar police station. A murder case has been registered, and investigations are underway.

Deputy Commissioner of Police (West) Girish S confirmed that the dispute over keeping the lights on was the immediate trigger for the crime.