According to an affidavit obtained by the Arkansas Democrat Gazette, Lewellyn admitted while being interviewed by police that he rammed her with his pickup truck.
He said he then loaded her into his vehicle and drove her to a remote location, where he raped her, and then buried her, per the affidavit.
When her boyfriend Alex Nicholson reported her missing after she failed to return home, a massive search operation was launched.
Lewellyn even joined the Facebook group dedicated to finding the missing nurse.
Investigators found her phone about a quarter mile from her home, almost 2.5 miles from where her body was buried.
Police identified Lewellyn as a suspect when data from his own phone placed him in the remote area where the victim was discovered. He was arrested on August 21.
Lewellyn is currently in jail without bail, and is set to be arraigned October 29.