The 1-year-old boy who died earlier this month at a Bronx day care found to house a covert drug-dealing operation died of a fentanyl overdose, the city medical examiner’s office confirmed Friday as it ruled his death a homicide. 

Little Nicholas Dominici was inside the Divino Niño Daycare in Kingsbridge on Sept. 15 when he died of Acute Fentanyl Intoxication, the Office of the Chief Medical Examiner said.  

The manner of death was determined to be a homicide, according to the ME’s office. 

Four people have been hit with federal charges over Nicholas’s death. 

Authorities allege the defendants – including the day care owner, Grei Mendez, and her husband Felix Herrera, who lived next door – ran a fentanyl-peddling operation out of the basement facility, leading to the tot’s death and to three other children being injured.