NEW YORK (CBSNewYork/AP) — The cause of Avonte Oquendo’s death cannot be determined, the New York City’s medical examiner’s office says.

The 14-year-old autistic boy disappeared from his Queens school on Oct. 4, setting off a massive search that included subway tunnels and regular announcements over the PA system at subway stations.

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His remains were found on the shore in College Point, Queens, several miles from where he vanished.

Avonte was severely autistic and unable to speak.

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The boy’s family has demanded an explanation from the city as to how Avonte was able to walk out of school unnoticed. They have said they plan to file a wrongful death lawsuit against the city.

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