Two individuals have been arrested in connection with the December disappearance of 20-year-old Heather Elvis – including one man who allegedly had an affair with the missing woman.

And his wife …

According to the Horry County (S.C.) Sheriff’s Office website, 38-year-old Sidney St. Clair Moorer and his wife – 41-year-old Tammy Lorinda Moorer – were taking into custody early Friday morning.

(Here’s a picture of the happy couple. And here are his and hers mug shots).

As of 1:30 p.m., charges against the Moorers had not been posted.

Elvis was last seen on December 17. Her car – a green 2001 Dodge Intrepid – was discovered two days later at a boat landing near Socastee, S.C.

The Horry County Police Department – another local law enforcement agency – executed a search warrant on Friday at the Moorers’ residence, located on S.C. Highway 814.

According to the agency the warrant was part of an effort to “identify potential evidence based on new information obtained through expert analysis of previously seized surveillance tapes in the area.”

The Elvis case is no typical disappearance …

For starters, the missing woman was allegedly involved in a sexual relationship with Sidney Moorer – who is an open relationship with his wife. In fact a reporter who claims to have interviewed Tammy Moorer last month states that Sidney Moorer had sex with Heather Elvis in her car “a total of three times.”

“He ended it when he realized something wasn’t right about her,” Tammy Moorer told the reporter.

Awesome …

UPDATE: Tammy Moore has been charged with two counts of indecent exposure and one count of obstruction of justice related to the search warrant served on her and her husband’s property. Huh? Indecent exposure charges related to a search warrant in connection with a missing person case? Yeah … welcome to South Carolina.