Former Illinois cop Drew Peterson is still behind bars for the murder of his third wife, but his fourth wife Stacy Peterson is still missing. The mystery is the focus of the newest episode of Nancy Grace’s A&E show “Grace vs. Abrams,” airing on Thursday night, and this episode of “Crime Stories.”

Nancy digs into the Peterson case with Drew Peterson’s former lawyer Joel Brodsky, Cold Case Research Institute director Sheryl McCollum, New York psychologist Dr. Chloe Carmichael, and WSB Radio reporter Robyn Walensky.

Also read: Nancy Grace offers a ‘new take’ on the Drew Peterson case on the latest ‘Grace vs. Abrams’

“Crime Stories with Nancy Grace” is a national radio show, heard on SiriusXM’s Triumph Channel 132, five times a day. You can also subscribe and download the daily podcasts at iTunes and Google Play.Nancy Grace offers a ‘new take’ on the Drew Peterson case on the latest ‘Grace vs. Abrams.’

[Feature Photo: Drew Peterson, Stacy Peterson/Handout]