A Wichita man has been convicted of voluntary manslaughter in connection with the disappearance and death of a Sedgwick County woman in April 2020, Kansas Attorney General Derek Schmidt said today. Robert Bruce Mans Jr., 50, of Wichita, entered a no contest plea in Marion County District Court to one count of voluntary manslaughter and one count of aggravated battery. Senior Judge Mark S. Braun accepted the plea and scheduled Mans to be sentenced on May 23 at 10:30 a.m. Mans was convicted for the death of Shalan Niccole Gannon, 27, of Wichita.