The suit alleges negligence in the death of the teen, who went missing from his school in October.
The family's lawyer says Avonte made a similar attempt to run a day prior to his disappearance.
In a post for Autism Speaks, Danny Oquendo thanked the city for helping search for his brother.
The DOJ said it would fund the devices after Sen. Schumer proposed "Avonte's Law" last week.
The devices would be voluntary and designed for parents of children who have a tendency to "bolt."
Vanessa Fontaine is seeking access to NYPD documents surrounding her son's disappearance on Oct. 4.
Investigators found a skull in College Point that they believe belonged to Avonte Oquendo.
Volunteers continue to search for the missing autistic teen, who was last seen Oct. 4.
The DOE will increase security after the disappearance of Avonte Oquendo, Chancellor Dennis Walcott said.
The family of Avonte Oquendo remain hopeful as the search for the missing teen enters its third week.
NYPD Commissioner Ray Kelly told a news outlet he's not sure Avonte Oquendo will be found alive.
Investigators were continuing their search for Avonte Oquendo, who disappeared from his school Oct. 4.
Volunteers were using kayaks to scour the shoreline while police are expanding their search.
The reward for the return of Avonte Oquendo has been increased to $70,000.
Avonte Oquendo, of Rego Park, has been missing for a week after he ran away from the Riverview School.
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