Authorities are checking with Haiti's national police to verify Caze's claim that the boy had suffered abuse during a recent stay with relatives in the Caribbean country, Cuevas said.
Jail records did not show whether Caze had an attorney.
The Department of Children and Families planned to ask a judge Wednesday for the state to retain custody of Ghanson's 4-year-old sister and 1-year-old brother.
The agency had contact with the family in 2010, and the case is being reviewed, according to a statement from DCF officials.
"My heart is breaking for this child," said DCF Interim Secretary Esther Jacobo. "Now we must focus our complete attention to protecting Ghanson's siblings and working with law enforcement to see that those responsible for his death are held accountable."