The Medical Examiner's Office was unable to determine the cause of death for Avonte Oquendo, officials said.
The cause and manner of death for the autistic14-year-old who went missing in October has been listed as undetermined, said Julie Bolcer, director of public affairs for the New York City medical examiner.
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Oquendo disappeared after walking out of his Long Island City school in the middle of the day on Oct. 4.
Family, friends, police and volunteers scoured the city for months in search of the teen, who was unable to communicate verbally.
DNA tests confirmed that human remains found washed ashore in College Point last month were those of Oquendo.
The family's lawyer, David Perecman, filed a notice of claim against the city in October, the first step in a lawsuit. Perecman said Oquendo should not have been allowed to leave the school and that school officials failed to call police quickly enough when it was discovered that he had disappeared.