New York ? A 4-year-old boy found unconscious in a squalid Bronx apartment visited previously by police and social workers died Monday while the city’s child welfare agency was still trying to explain another youngster’s death three weeks ago.

Investigators were questioning 4-year-old Quachon Brown’s mother and her boyfriend.

Late last year, caseworkers had visited the apartment where Quachon and his siblings lived and deemed it “to be in order,” agency head John Mattingly said.

The agency investigated the home based on a Nov. 15 complaint from the school of one of Quachon’s siblings, who range in age from 5 months to 11, Mattingly said. The nature of the complaint was not disclosed.

On Monday, police found Quachon unconscious. Quachon and four other children were found without clothes, sleeping in the same bedroom, police said.

The mother told investigators that a television fell on the boy on Sunday and that he began vomiting the next day, Police Commissioner Raymond Kelly said.

The child welfare agency underwent a shake-up after the Jan. 11 death of 7-year-old Nixzmary Brown. Reports of her suffering had been made to several agencies, including schools, police and child welfare.