MOORHEAD, Minn. (trfnews.i234.me) – A court has imposed communication restrictions on 18-year-old murder suspect Isaac Arndt in Clay County. Arndt is accused of the August killing of 14-year-old Jaelyn Walker in Moorhead. During a recent motion hearing, investigators reported monitoring Arndt’s jail communications and raised concerns about his attempts to contact a juvenile witness through her brother via texts and phone calls. In a text dated December 25, Arndt allegedly blamed an individual for the escalation of his charges from second-degree to first-degree murder and mentioned having “bounties on people’s heads,” specifically referencing a juvenile witness.