(CNN) - DNA testing confirmed that human remains found in New York last week were those of Avonte Oquendo, a 14-year-old boy with autism who disappeared in October, the spokeswoman for the city Office of the Chief Medical Examiner said Tuesday.
Police on Thursday found legs and an arm next to the East River in Queens, as well as size 5½ Air Jordan sneakers that match the shoes of Avonte Oquendo, the teen's family attorney, David Perecman, told CNN on Friday.
Investigators also found size 16 dark jeans, the same size Avonte wore, and underwear, the lawyer said.

The boy's mother, Vanessa Fontaine, who never gave up hope that she would find her son alive, provided the DNA sample police used to verify they had found the child's remains.
After he had been missing for three weeks, she addressed reporters at an October 25 news conference.
"My thoughts are that my son is still out there, and I want everyone to continue to help me search for my son," Fontaine said. "He is not gone."

In the search for Avonte, police deployed sniffer dogs, combed surveillance footage, searched the sewer system, put up posters for missing persons, and filled the streets with fliers. There were alerts on the New York subway and messages in local newspapers. Divers used sonar to explore the city's waterways.

Avonte, who had the mental capacity of a 7- or 8-year-old, was supposed to be with a monitor at all times, Fontaine said. But surveillance footage that captured her son bounding out of Center Boulevard School on Long Island at 12:38 p.m on October 4 did not show him with a supervisor.
"He doesn't know that, you know, 'I can get hurt in the street, someone can grab me and take me,'" his mother said. "He doesn't know that. He doesn't know fear."

New York police patrol cars and search vehicles played a recording of Avonte's mother calling for him into the streets, Keith Brooks, director of operations for CityWide Disaster Service, said in October.
"Avonte, this is your mother. You are safe. Walk toward the lights," the message repeats.
The hope was that the teen, who could not communicate verbally, would hear the sound of his mother's voice and approach the emergency vehicles.