Police have found the body of Academy Award-winning actress Jennifer Hudson's nephew. Julian King's body had been left in the back seat of a stolen car found abandoned on a Chicago street. The seven-year-old vanished on Friday after his mother, Julia, found her mother and brother shot dead at the family home. The boy was believed to have been in the house with his grandmother, Darnell Donerson, 57, and uncle, Jason Hudson, 29, before the shooting. Julia Hudson's husband, William Balfour, had been held by police since the killings but he has not been charged. The family recently offered a reward of £63,000 for the safe return of the boy. Balfour, 27, had a relationship with Hudson's sister Julia but is not the father of the missing boy. Balfour's mother said earlier her son and Julia were estranged and that he had nothing to do with the murders. 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. Mr O'Brien said more than one person had been questioned but that no one had been charged with a crime. He did not release any names. On Friday, police spokeswoman Monique Bond said of the murders: "It appears to be domestic related." Hudson shot to fame in 2005 as a contestant on US TV hit show American Idol. She has also starred in the film version of the stage musical Dreamgirls for which she won an Oscar for best supporting actress. She has since appeared in the movie version of Sex and the City and is currently in The Secret Life of Bees.