Denim Brown was left in the care of a babysitter inside a New York Avenue apartment in Crown Heights on Sunday.
The 3-year-old was rushed to Kings County Hospital with head and neck trauma just before 9:45 p.m. where he was pronounced dead.
On Tuesday, police announced 29-year-old Kevin James was charged with murder, assault and acting in a manner injurious to a child.
James is the stepson of the boy's 54-year-old babysitter, who is a family friend of Brown's mother.
The suspect lives in the same building as the victim.
Few other details were released.
ALSO READ: City officials, residents await arrest of 'worst landlord'
Arrest warrant issued for one of NYC's 'worst' landlords
----------
* More Brooklyn news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube