The incident took place last on Tuesday last week when the Constable Vilas Shinde (50) from Bandra traffic division was discharging his duty at a petrol pump when he spotted a biker without helmet approaching the petrol pump.
The juvenile was nabbed by police in the late hours on the same day.
Shinde who was in a critical condition and was unconscious since last week, passed away at the Lilavati Hospital this afternoon, police said.
(REOPENS BES14)
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Terming the constable's death as a 'sad' incident, Mumbai Police Commissioner Datta Padsalgikar said, "Vilas Shinde was assaulted while he was doing his duty. It's very disheartening, if such incident happens during course of duty.
(Reopens BES28)
Chief Minister Devendra Fadnavis met the family of Shinde here today and promised all possible help by state government.
He assured a job to a family member of the deceased and also financial assistance.