Entertainment Tonight.The man accused in the killings of Oscar-winning actress and singer Jennifer Hudson's mother, brother and nephew has entered a plea in the case.William Balfour pleaded not guilty to charges of first-degree murder and home invasion, says the Associated Press.Balfour, who is the estranged husband of Jennifer Hudson's sister Julia, entered his plea Tuesday at Cook County Criminal Court in Chicago. He is next due in court on January 27, and is being held without bail, says the AP.The bodies of Hudson's mother, Darnell Donerson, 57, and brother Jason Hudson, 29, were found shot to death last October in Donerson's South Side Chicago home -- and the body of Hudson's 7-year-old nephew Julian was found three days later in an SUV.Hudson is scheduled to sing the national anthem at the Super Bowl on February 1, the NFL announced last week in a press release.