Police searching for Jennifer Hudson's seven-year-old nephew today confirmed that they have found his body.
Julian King was last seen on Friday, when the Oscar-winning actress' mother and brother were found shot dead in their Chicago home, police said.
Ms Hudson offered a $100,000 reward for the safe return of her nephew last night.
The body was found inside a white SUV vehicle. Police have not said how or when the boy died and no-one has been charged.
Over the weekend, Chicago police spokesman Daniel O'Brien said the FBI had been asked to help in the search in case the boy had been taken across state lines, in violation of federal kidnap laws.
He declined to confirm various media reports that police had taken William Balfour into custody as a suspect in the homicide investigation.
Mr Balfour, 27, had a relationship with the boy's mother. His mother said earlier her son and Julia were estranged and that he had nothing to do with the killings.
The Illinois Department of Corrections website lists Balfour as having been convicted of attempted murder, car theft and vehicular hijacking. He was released from prison in 2006.
Media reports said Jennifer Hudson was in Florida when she was told of the shootings, and was heading back to Chicago.