CHICAGO, Illinois (CNN) -- A handgun found this week was used in the shooting deaths of Oscar-winning actress Jennifer Hudson's mother, brother and nephew, Chicago Police Superintendent Jody Weis said Friday.
An investigator picks up a gun discovered not far from where Jennifer Hudson's nephew was found slain.
Police said they discovered the .45-caliber gun Wednesday in an alley on Chicago's West Side.
The alley was within a block of where the body of Hudson's 7-year-old nephew, Julian King, was found Monday in a white Chevrolet Suburban.
Police had launched a massive search for the boy October 24, when the bodies of Hudson's mother, Darnell Donerson, and brother, Jason Hudson, were found in their South Side Chicago home.
All died from multiple gunshot wounds.
Julian was the son of Jennifer Hudson's sister, Julia Hudson, who police said found Donerson's body and called police.
No one has been charged in the deaths. Police have questioned William Balfour, 27 -- Julian's stepfather and Julia Hudson's estranged husband -- in connection with the slayings, a police representative said.
Balfour was later taken to prison on a parole violation, the police representative said. According to the Department of Corrections, he spent nearly seven years in prison for attempted murder, vehicular hijacking and possession of a stolen vehicle.
The Illinois Department of Corrections said it could not comment on the specifics of Balfour's parole or how he violated it. He will be held until a prisoner review board takes up his case, a department representative said. The process could take several weeks.
William Balfour's mother, Michele Davis-Balfour, has said that her son had nothing to do with the slayings.
The funerals are set for Monday morning and will be private.
Hudson won a best supporting actress Oscar for her portrayal of Effie White in the film version of the Broadway musical "Dreamgirls." She competed on the third season of "American Idol" in 2004, making it to the top seven contestants before being eliminated from the contest.
Hudson and her sister, Julia Hudson, announced Thursday that they have established the Hudson-King Foundation to provide food, clothing and shelter, along with grief counseling, to relatives of victims of violent crime.