CHICAGO , Illinois ( CNN ) -- The body found inside an SUV Monday morning has been confirmed to be Oscar-winning actress Jennifer Hudson 's 7-year-old nephew , a top FBI official said . The white SUV where the child 's body was found is taken away to be examined by investigators . The medical examiner positively identified the body found in the white Chevrolet Suburban as Julian King , Chicago Police Superintendent Jody Weis said Monday afternoon . Julian had been shot to death , said police spokeswoman Monique Bond . Police are collecting evidence from the Suburban and reviewing surveillance tapes from all over the city as the investigation continues , Weis told reporters . `` There 's a lot of work to be done . We 'll be sure we go through this thoroughly , '' he said . Asked about possible motives , Weis said , `` We do n't know what the motive really was at this time . But , clearly you have people who do know each other , so it was n't a case of a stranger-type homicide . '' Earlier Monday Deputy Chief Cmdr . Wayne Gulliford said police found the body inside a parked white Chevy Suburban with a license plate matching the description in the child 's Amber Alert , after responding to `` a call about a suspicious auto '' on Chicago 's West Side at approximately 7 a.m . He had no details on the body , pending the medical examiner 's report . Julian has been missing since Hudson 's mother and brother were found dead in their home Friday . Watch police say they 've ID 'd the body » . Over the weekend , Hudson offered a $ 100,000 reward for the safe return of her nephew . `` Please keep praying for our family and that we get Julian King back home safely , '' Hudson said in a posting on her MySpace page Sunday . `` If anyone has any information about his whereabouts please contact the authorities immediately . '' Hudson also posted two pictures of her nephew wearing the brown-and-orange striped polo shirt he was wearing when he was last seen . Earlier , Hudson viewed the bodies of her mother , Darnell Donerson , and brother , Jason Hudson , the Cook County medical examiner 's office told CNN on Sunday . They were found shot to death Friday in their South Side Chicago home . Watch the latest on the Hudson case » . Julian 's stepfather , William Balfour , was detained over the weekend for questioning in connection with the case , a police spokesperson told CNN . He was subsequently transferred to prison on a parole violation charge , the spokesperson said . No charges had been filed against anyone in connection with the murders . According to the Illinois Department of Corrections , Balfour , 27 , spent nearly seven years in prison for attempted murder , vehicular hijacking and possessing a stolen vehicle . Chicago news station WLS reported Saturday that Julian was not with Balfour when he was detained . Hudson 's sister , Julia Balfour , made an emotional appeal Saturday for the safe return of her son . `` My greatest fear has already happened , my greatest hope is for having my child . I just want my son , '' Julia Balfour said . `` That 's all I have to say . Just let my baby go . '' William Balfour 's mother , Michele Davis-Balfour , also urged the public to focus on finding Julian and said her son had nothing to do with the slayings . `` Out of no means did my son do this . This heinous crime to this family is unbelievable . It 's unbearable , '' Davis-Balfour told WLS . Watch Davis-Balfour 's emotional appeal » . Deputy Police Chief Joseph Patterson said the bodies of Hudson 's mother and brother were found about 3 p.m. Friday , when a relative arrived and found the body of a woman on the living room floor . The relative backed out of the house and called police , Patterson said . Authorities found a man shot to death in a bedroom . The Cook County medical examiner 's office said Saturday that Donerson and Jason Hudson suffered multiple gunshot wounds and ruled the deaths homicides . Neighbors reported hearing gunshots earlier Friday , Patterson said . Authorities found no signs of forced entry to the home and were not sure whether other items were missing . Watch the scene outside the house » . `` You 've got two people who were killed inside a home . That alone will produce a great deal of evidence , '' Chicago Police Superintendent Jody Weis said of forensic evidence at the crime scene . Hudson won a Best Supporting Actress Oscar for her portrayal of Effie 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 . CNN 's Susan Roesgen and Kevin Bohn contributed to this report .
NEW : Hudson , Friday , was shot to death , a police spokeswoman says . Police collecting evidence from Suburban , reviewing surveillance tapes . Julian King missing since 7 , when Julian King 's mother , brother were shot dead . Actress identified bodies of her mother and brother for medical examiner .