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Natasia Snape, 23, had been driving 'erratically' through Boca Raton in Florida's Palm Beach on Friday morning (9 April), according to court documents.
Boca Raton Police said she had been driving a red two-door sedan when she went around stopped traffic and mounted the sidewalk, in turn hitting 75-year-old Judge Sandra Feuerstein of Long Island.
Feuerstein was transported to Delray Medical Center, and was pronounced dead.
Snape also struck a six-year-old boy, who had been crossing the road towards the beach.
A Boca Police spokesperson said on Sunday that the boy was treated at a hospital for non-life-threatening injuries, and has been released.
Snape did not stop after the incident, and fled in her car - only to crash five miles north in Delray Beach.
The police report said officers who responded to the second crash thought Snape was unconscious at first, but then saw her 'begin to convulse or have seizure-like movements'.
Not making any eye contact with the officers, she was described as not 'moving around as the typical person would be who had just been involved in a crash', and after being placed in an ambulance 'began to scream and fight with medics stating that she was Harry Potter'.
The police report said that officials looking for Snape's ID found small containers labelled 'THC cannabis' and a synthetic drug known as T salts, which is 'commonly known to cause erratic excited delirium-like behavior'.
The US Attorney's Office for the East District of New York has since offered condolences to Feuerstein's family.
Acting U.S. Attorney Mark J. Lesko said: "As we mourn her tragic death, we also remember Judge Feuerstein's unwavering commitment to justice and service to the people of our district and our nation."
Born in New York in 1946, Feuerstein attended the University of Vermont and earned her JD at Yeshiva University in 1979.
She was appointed to the federal bench by President George W Bush after 16 years as a New York state judge.
Eugene Corcoran, the Eastern Court District's executive, said Judge Feuerstein's 'eccentric style and warm personality lit up the courtroom', adding: "She will be missed by her colleagues and litigants alike."
Snape was charged with leaving the scene of the crash involving injury, leaving the scene of a crash involving death and vehicular homicide.
Each count carried a $20,000 bond, according to The Palm Beach Post.
She was booked into the Palm Beach County Jail early on Saturday morning and ordered to surrender her passport.
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