Oscar-winner Jennifer Hudson's next big role will be under a very different spotlight - in Chicago's drab criminal courts building at the trial of the man charged with murdering her mother, brother and seven-year-old nephew in 2008.

Hudson's presence is bound to affect the proceedings, which begin on Tuesday.

That is when presiding judge Charles Burns plans to start questioning would-be jurors, trying to weed out anyone who could be swayed by Hudson's celebrity status.

Legal experts widely agree on the toughest challenge at trials involving stars - identifying 12 jurors able and willing to assess guilt solely on what is heard in court.

Hudson is expected to be at the trial every day once testimony begins, court officials say. She is also on a list of witnesses who might testify.