The Tennessean (http://tnne.ws/1o3Tqan) reports that 27-year-old Wayne Masciarella entered the plea Wednesday during a brief court appearance in Putnam County.
Police say they think Masciarella stabbed 23-year-old Courtney Cash to death after getting into an argument with her and her boyfriend.
Cash's body was found March 19 inside a wooden box at her home in Baxter. Her boyfriend, William Austin Johnson, also suffered stab wounds.
A motive has not been released, but Putnam County Sheriff David Andrews has indicated the stabbings were likely connected to drugs.
Information from: The Tennessean, http://www.tennessean.com