CHICAGO — Jury selection wrapped up Tuesday for the Chicago trial of the man accused of killing the mother, brother and 7-year-old nephew of actress and singer Jennifer Hudson.

The final four panelists were chosen on the second day of one-by-one questioning of prospective jurors.

The specter of Hudson’s star power and how it could affect proceedings loomed over the two days of jury selection this week.

Before he let those chosen Tuesday head home, Judge Charles Burns warned them not to switch on “American Idol” this Thursday because Hudson may appear on the show, on which she first rose to fame as a contestant in 2004.

During juror questioning Tuesday, William Balfour (pictured), 30, sat unsmiling and slumping in his chair. But he kept his eyes fixed on each would-be juror as they sat a few feet across a table to answer questions.

Balfour, the estranged husband of Hudson’s sister, is accused of shooting to death Hudson’s mother, Darnell Donerson, 57, brother, Jason Hudson, 29, and her 7-year-old nephew, Julian King. Jennifer Hudson is on a 300-name list of potential witnesses and is expected to attend each day of the trial once testimony begins April 23.