The incident is currently under investigation by the Porter County Sheriff's Department.
The child suffered multiple injuries to his body and he was taken to Comer Children's Hospital.
The woman's death was ruled an accident, according to the Lake County coroner's office.
The boy and the person walking with him were cited for disregarding a railroad signal, police said.
The victim died from her injuries on Tuesday after being airlifted to a South Bend hospital.
The boy suffered head trauma and internal trauma and was in critical condition when he was transported for medical care, Gary police said.
The person was walking on the side of the road when a car struck them, firefighters said.
The victim was taken to St. Mary Medical Center after being struck by a vehicle.
The 45-year-old man was badly injured and a medical helicopter was requested, but it was unable to fly to the scene due to weather conditions.
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