The Insider.com

Jennifer Hudson is the latest superstar to appear on Oprah's Next Chapter, and in this sneak peek of the upcoming interview, Hudson is still clearly grieving over the family tragedy she endured four years ago when her mother, brother and nephew were murdered.

• August 27, 2012Surprising Celebrity Pregnancies
• August 27, 2012Snooki Tweets About Her Little Meatball
• August 27, 2012Hot New Romance!
• August 27, 20125 Things You Don't Know About Hayden Panettiere
• August 27, 2012Journey Gets $500k to Play VIP Republican Bash
• August 27, 2012Harry's Nude Pics Become Vegas Ad

William Balfour, Jennifer's sister's ex-boyfriend, was found guilty of the murders as well as home invasion, aggravated kidnapping, residential burglary and possession of a stolen motor vehicle in May. He now faces mandatory life in prison.

Related: Jennifer Hudson to Design Her Own Wedding Dress

For the first time ever, Jennifer and her sister Julia sit down together for an interview, where they both shed tears and nod emphatically when asked if they knew immediately "who did it" after discovering the murders.

Jennifer's fiancé David Otunga, a professional WWE wrestler who also appeared on the VH1 reality show I Love New York 2, also makes an appearance during the intimate chat held at her home in Chicago, when Oprah puts the couple in the hot seat by asking about their upcoming wedding!

Check out the video for Jennifer's emotional reaction.

Video: Jennifer Hudson Fashion Time Warp

Oprah's interview with Jennifer airs Sunday, September 9 at 9 p.m. on OWN.