Dustyn Skyler Roff died Friday. Investigators believe he was the victim of continuous physical abuse.
Police arrested the boy's mother -- Britni Glover -- and charged her with injury to a child. Now, they want to talk to her boyfriend.
Dustyn was found Friday at his mother's apartment in the 7000 block of Hillcroft. According to Houston police, the child was alive when emergency workers arrived, but he died later that day.
Homicide investigators say the child was found by his mother. An exact cause of death has not yet been determined.
Glover's boyfriend has not been charged, but he is wanted for questioning in Dustyn's death. Authorities are not yet releasing his name.
The child's father does not live at the apartment. He declined our request for an interview Sunday night, saying he was too distraught.
An autopsy will be performed to determine how Dustyn died.
Glover's bond has been set at $10,000.