A woman riding her bicycle Saturday night was struck by a vehicle in Littleton, Massachusetts, police said.
The 54-year-old woman was hit at about 10 p.m. in the area of 185 Great Road.
The victim was in serious condition when she was taken to Lahey Clinic in Burlington. Police said Sunday, the woman later died from her injuries.
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Authorities are reconstructing the scene as part of the investigation.