The FBI joined the search Saturday for the 7-year-old nephew of Oscar-winning actress Jennifer Hudson, still missing a day after the bodies of Hudson's mother and brother were found in the actress' childhood home. A suspect in the deaths remained in custody Saturday, but young Julian King had not been seen since the bodies of Darnell Donerson, 57, and Jason Hudson, 29, were found Friday afternoon. “We need to find that kid by sundown,” Ziff Sistrunk, a friend of the Hudson family, said Saturday. Because of the possibility the boy may have been taken across state lines, police spokesman John Mirabelli said the FBI has been asked to assist in the search. FBI spokesman Ross Rice confirmed the agency was helping to look for the child, but he declined to provide details. Neighbors, friends and relatives gathered Saturday outside the three-story white house on the city's South Side where Hudson went to school and sang in church. Some left stuffed animals and flowers, and others planned a search for Julian. Members of Hudson's family were expected to make a statement later Saturday. A family member entering Donerson's home Friday afternoon found her shot on the living room floor. Officers later found Hudson shot in the bedroom, police said. At least one of the victims suffered defensive wounds, said authorities who described the shooting as domestic violence. The Cook County medical examiner's office said Saturday that Donerson and Jason Hudson died of gunshot wounds. Their deaths were ruled homicides. William Balfour, a man suspected in the deaths, was arrested Friday but had not been charged, law enforcement sources told the Chicago Tribune and Chicago Sun-Times. Police spokeswoman Monique Bond, who declined to comment Saturday on a suspect, said no one had been charged. Bond said investigators were talking to “a number of people in custody,” but she declined to elaborate. An alert issued statewide Friday, which remained in effect Saturday, said Balfour was a suspect in the double homicide. Records from the Illinois Department of Corrections show Balfour, 27, is on parole and spent nearly seven years in prison for attempted murder, vehicular hijacking and possessing a stolen vehicle. Public records show one of Balfour's addresses as the home where Donerson and Jason Hudson were shot. Balfour's mother, Michele Balfour, said that her son had been married to Hudson's sister, Julia Hudson, for several years, but that they were separated. She also said Donerson had ordered him to move out of the family's home last winter. Family friends said King is Julia Hudson's son, but authorities would not confirm that. Jennifer Hudson's personal publicist, Lisa Kasteler, said the family wanted privacy. She did not return messages seeking comment Saturday.