A deer hunter stumbled on the remains three years after she died. They sat unidentified until last summer, The New York Times reported Wednesday.
The girl's sister, Iyonna Jones, 21, told police their mother killed Jon-Niece, stuffed her into a garbage bag and drove her out of Manhattan in 2002. Police confirmed Iyonna's relationship to the remains through DNA testing.
Iyonna said her mother -- who died from medical complications months after Jon-Niece's death -- had help from the girls' aunt, uncle and aunt's boyfriend.
Likisha Jones, 39, James Jones, 35, and Godfrey Gibson, 48, have been charged with several counts of obstructing justice, the Times reported.
"Whenever you find remains, especially that of a child, you want to break the case," said Christopher J. Gramiccioni, the acting prosecutor in Monmouth County. "And we're glad we did."
New York State Police have labeled the death of Jon-Niece Jones a homicide though they are still investigating the case.