Grief-stricken Jennifer Hudson has offered a $100,000 reward for the safe return of her missing nephew, 7-year-old Julian, who has been gone since Friday, the day the actress’s mother and brother were fatally shot in their Chicago home.

Chicago police detectives continue their investigation of the fatal shooting of Darnell Donerson, the 57-year-old mother of Academy Award winning actress Jennifer Hudson, and Jason Hudson, her 29-year-old brother.

The two were found shot to death in their Chicago home by Julia Hudson, the actress’s sister, when she returned from work. Her 7-year-old son, Julian King, has been missing since Friday. A state-wide amber alert has been called in Illinois for the missing child.

Police investigators think the killings may have been caused by a domestic disturbance. Julian King is thought to have been in the house when the double murder took place. William Balfour, Julia Hudson’s husband and step-father to the little boy, has been in police custody since Friday. The 27-year-old man was taken into custody for questioning and things do not look well for him.

Sunday, he was transferred to state custody for violating his parole – he had been on parole after spending nearly seven years behind bars for attempted murder, hijacking and possessing a stolen car – because he stopped cooperating with police in the investigation of the double murder and Julian’s disappearance, reports the Chicago Tribune.

Balfour has denied being involved in the killings or disappearance, law-enforcement sources told the Tribune, but his being named as a suspect in the case constitutes a violation of his parole, since his transfer to a state facility.

No charges have been issued against Balfour yet. Police officials would only say he was being interviewed but a spokesperson for the Illinois Department of Corrections said Sunday he had been named a suspect. Balfour’s mother has denied he had anything to do with the slayings or Julian’s disappearance and said Balfour had been thrown out of Donerson’s home at the deceased woman’s request last winter.

Also Sunday, Jennifer Hudson issued a statement through her publicist, Lisa Kasteler, expressing her gratitude for the support and encouragement she and her family have received and offering a $100,000 reward for the little boy’s safe return.

The previous day, Julia Hudson pleaded for her child to be returned to her during a press conference held at the Pleasant Gift Missionary Baptist Church. “I don’t care who you are, just let the baby go,” she said, adding that the whole family was in a state of shock and that she did not know what else to do but pray.

Chicagoans have been showing their support all weekend, with hundreds of people stopping by the family home to pay tribute.

The Chicago office of the FBI is assisting Chicago police in the case.