Suspect in Custody in Hudson Family Slayings; FBI Helps Search for Nephew

Chicago police arrested a man in hopes of locating Jennifer Hudson's missing nephew, Julian King, but the boy was not with him

The FBI has joined the search for Jennifer Hudson's 7-year-old nephew, who has been missing since yesterday's shooting deaths of her brother, Jason Hudson, 29, and mother, Darnell Donerson, 57.

Responding to a call made by a family member who discovered the bodies, police found the pair a little before 3 p.m. Friday at Donerson's home on Chicago's South Side.

Authorities have arrested William Balfour, the estranged husband of Hudson's sister Julia, whose son Julian King has not been seen since the shootings. A friend of Julia's exclusively told E! News that Balfour, 27, is not the biological father of the missing boy.

The FBI was called into the search because of the possibility that the boy was taken across state lines. Law enforcement sources tell the Chicago Tribune that they were hoping to find Julian when they picked up Balfour but that the boy was not with him.

Police said that there were no signs of forced entry and they are treating the case as a domestic matter. No charges have been filed.

Per the Tribune, Cook County records show that Balfour is on probation after serving seven years in prison for attempted murder and vehicular hijacking. He was released in May 2006. The Donerson residence is listed in public records as one of his last known addresses.

Donerson's next-door neighbor, Angela Russell, told E! News that she heard gunshots early this morning. An Amber Alert was issued this afternoon for a white 1994 Chevrolet Suburban with the license plate number X584859.

(Originally published Oct. 24, 2008, at 10:23 p.m. PT.)