Chicago police may have only one acknowledged suspect in the murders of the mother, brother and nephew of Academy Award-winning actress Jennifer Hudson, but some hints point out that more than one person may have taken part in the tragic event, the Chicago Tribune cited law-enforcement sources as saying.

Officials have concentrated on William Balfour’s actions on Friday, the day the killings occurred, and his clashes with his estranged spouse, Julia Hudson, Jennifer Hudson’s sister, as well as his relationship with her relatives.

Investigators are trying to find out whether William Balfour is the murderer of the three people and if he had an accomplice in the slayings. In addition, it is still to be determined whether another person took him to the West Side following the unfortunate event which happened at the Hudson’s South Side residence.

According to the newspaper, witnesses said that William Balfour drove his vehicle to the Hudsons' block on Friday, where he showed up at approximately 7 a.m., but police found the Chrysler later on parked outside Robeson High School, which is located about one mile away from the spot where it had been initially seen.

Moreover, William Balfour’s girlfriend reportedly informed police that her boyfriend arrived at her West Side residence shortly after the slayings at the Englewood house took place.

Darnell Donerson, Jennifer Hudson’s 57-year-old mother, and Jason Hudson, the actress’ 29-year-old brother, were found shot to death on Friday at their home. Julian King, Julia Hudson’s son, was at his grandmother’s place when he disappeared. After police issued an Amber Alert for him and a 1994 white Chevrolet Suburban which had been linked to the murders, the 7-year-old boy’s body was found on Monday Morning in the back of the mentioned vehicle, which belonged to Jason Hudson.

The SUV was discovered on a West Side street, after a citizen called in about a suspicious parked vehicle in the 1300 block of South Kolin Avenue on Chicago’s West Side.

After performing an autopsy on the remains of Julian King, the Cook County medical examiner has ruled the death of Jennifer Hudson’s nephew a homicide, as the boy died of multiple gunshot injuries to the head.

Although William Balfour, King’s stepfather, has not been charged with the murders, he is being held in custody due to parole violation. He is on parole after spending several years in prison for attempted murder, vehicular hijacking, as well as possessing a stolen vehicle, according to the Department of Corrections’ Web site.

Nevertheless, new information on Balfour’s criminal past has been revealed on Tuesday. In June, while he was on parole for a 1999 attempted murder conviction, William Balfour was detained by police for possession of cocaine. Police found drugs in Balfour’s car after stopping him for high speed driving. Officials were investigating some reported gunshots and, after searching Balfour’s vehicle, they discovered a rock of cocaine.

However, the case was dropped in July, as a judge ruled that police had no probable cause to send Balfour behind bars.

While Balfour is in police custody, Julia Hudson wrote on her MySpace page that she took comfort in the fact that her son was next to her mother and brother and that he was protected from all dangers.

“His lil soul is at ease, I take comfort in knowing that Julian is with my mother and my brother and most of all the Lord and now he’s my angel he’s protecting me.”