A task force of more than 15 local, state and federal investigators is ramping up the investigation into a missing 20-year-old South Carolina woman whose car was found abandoned on a boat landing nearly two months ago.
Heather Elvis, of Myrtle Beach, S.C., was last heard from in the early morning hours of Dec. 18, after the young woman went on a date. Elvis' 2001 Dodge Intrepid was discovered the next day on the Peachtree Boat Landing in Socastee, Horry County.
Authorities have issued 15 search warrants in the case and administered polygraph tests, but have not yet named a suspect, according to local press reports.
Investigators said Elvis was driven home by her date to the apartment she shared with another woman in River Oaks some time before 2 a.m. on Dec. 18. The young man with whom Elvis met for the date has been ruled out as a suspect, a source close to the investigation told FoxNews.com. Authorities believe that at some point later, Elvis drove herself to the boat landing, though the reason remains unknown.
Horry County investigators confirmed to MyHorryNews.com that cell phone records show Elvis communicated with a man, whom the website identifies as 38-year-old Sidney Moorer, as late as 6 a.m. on Dec. 18. Police records obtained by the website state that Elvis had a relationship history with Moorer, of Horry County.
The website also reports that Elvis' roommate, Brianna Warrelmann, received a distressing phone call from Elvis at 1:44 a.m. Dec. 18. Warrelman told authorities that Elvis "seemed like she was crying and upset" after receiving a phone call from Moorer, according to the website.
Moorer, who has not been named a suspect, told police that he had not seen Elvis since October, the police report states. Moorer later told authorities that he spoke to Elvis the night before she disappeared, MyHorryNews.com reports -- a conversation during which Moorer claims he told Elvis to, "quit calling him."
Elvis' father, Terry, said in a previous interview that he suspects foul play, calling his daughter's disappearance, "way out of character."
"She's a beautiful young lady," Terry Elvis told FoxNews.com last month. "She’s a good-hearted girl . . . always helpful and active in her church activities. Everybody loved her."
A task force of about 15 investigators has been assigned to the case, including two Myrtle Beach police detectives and individual investigators from the U.S. Marshall's Office and FBI.
Authorities as well as more than 300 volunteers have scoured heavily wooded areas surrounding the boat landing for any sign of Elvis since her Dec. 18 disappearance. One of the searches led to the discover of adult human remains, but authorities said they had been for "some time" and belong to a man.
Lt. Chip Squires, Horry County's lead investigator in the case, was not immediately available for comment when contacted Friday.
Anyone with information on the case is urged to call the Horry County Police Department at 843-915-5350. Tips can also be sent to firstname.lastname@example.org.
Cristina Corbin is a Fox News reporter based in New York. Follow her on Twitter @CristinaCorbin.