“We can confirm that there is an ongoing investigation concerning the deaths of Jennifer Hudson’s mother, Darnell Donerson, and her brother, Jason Hudson,” Lisa Kasteler, a rep for the actress, said in a statement Friday. “No further comment will be made and the family has asked that their privacy be respected at this difficult time.”

William Balfour Mugshot Photo 1998

According to the Associated Press, Chicago Police are looking for William Balfour in connection with the slayings. Authorities have issued an Amber Alert for 7-year-old Julian King, Balfour’s son with Jennifer’s older sister Julia. They are seeking a 1994 white Chevrolet Suburban.

Update: William Balfour, 27, has been taken into custody and is being questioned by authorities, the Associated Press reports. Police say Balfour is not cooperating, but no charges have been filed. Julian King, Jennifer’s 7-year-old nephew is still missing.