Drew Peterson, a former Illinois cop behind bars for the murder of his third wife, still hasn’t been charged in the mysterious disappearance of his 4th wife. Nancy Grace and Dan Abrams dig into the case on the upcoming A&E show, “Grace vs. Abrams,” airing on Thursday.

Peterson insisted that Stacy Peterson, his 4th wife, left him for another man. It’s something Stacy’s friends and family have a hard time believing. Instead, they feel she died at the hands of her husband as his third wife, Kathleen Savio did.

The latest Grace vs. Abrams episode includes interviews with several key people in the notorious case, including Peterson’s former defense attorney Joel Brodsky; Stacy’s pastor, Neil Schori; Petersons’s friend Rick Mims; and Nicole Speakman (who dated once dated Peterson). Further, Peterson’s second wife, Vicki Connelly, speaks out publicly for the first time ever in an exclusive interview with Grace and Abrams.

“Drew Peterson has not been charged for his fourth wife’s disappearance,” Abrams told AJC. “There’s been talk that could happen. It’s not a dormant case…. A lot of people have theories but I think it’s important to be able to dig in.”

Grace added that she has a “new take” on the Peterson case, which she’ll discuss before a live studio.

“Grace vs. Abrams” air at 11 p.m. on Thursday on A&E.

[Feature Photo: Nancy Grace and Dan Abrams/ Christopher Gregory]