A guilty plea is expected when Clay Waller appears in court this week. Waller is accused of murdering his wife, Jacque Waller. She went missing after telling people she was going to meet with her estranged husband in 2011. Search teams found her body last week across the river from Cape Girardeau. Clay Waller is already in prison for harassing Jacque's sister. If he submits the anticipated plea, the next step would be setting a sentencing date. The couple's triplets are now seven years old and live with Jacque's sister.