William Balfour, who was being held at Stateville Correctional Center on parole violations from a previous conviction, was arrested and charged with the murders Dec. 1, police said.

Long the sole suspect in the shootings, Balfour was taken into custody soon after the bodies were found. He refused to take a lie detector test and reportedly stopped cooperating with detectives.

Police have said they believed Hudson’s sister was in an argument with Balfour around the time of the shootings. While the bodies of Hudson’s mother and brother were found in the family home Oct. 24, the body of her nephew was found days later in an abandoned SUV in a West Side neighborhood.

An unnamed police source reportedly told the Chicago Sun-Times that the case against Balfour is still largely “circumstantial” and no court hearings had been set at press time.