A 4-year-old girl who was knocked down by a two-wheeler in Ulhasnagar in Thane district on September 10 has died while undergoing treatment in a hospital in neighbouring Mumbai, police said on Tuesday.

Nishita Gautam, who was crossing the road at the time, was severely injured in the accident, which took place in Subhash Tekdi area under Vithalwadi police station limits, an official said.