I don't think anyone has posted a transcript of the press conference announcing the murder charges against SM/TM, so here it is for reference purposes. It was very short and to the point:
Press Conference with Horry County Police Chief Saundra Rhodes, February 24, 2013
http://www.wbtw.com/story/24804575/murder-charges-added-for-horry-county-couple-in-connection-with-heather-elvis-case
SR: Good morning. As Lt. Kegler said, we just want to give you an update on this case. I'll start from the beginning for you. On December 19, 2013, Heather Elvis' vehicle was found at Peachtree Landing. On December 20, when she was reported missing by her family, a full investigation was launched by the Horry County Police Department Major Crimes Unit. A seven-agency task force was then formed to investigate the disappearance of Heather Elvis. On February 21, as a result of the investigation, a search warrant was conducted at the home of Sidney and Tammy Moorer. Sidney and Tammy Moorer were taken into custody and charged with one count of Obstruction of Justice and two counts of Indecent Exposure on the following day. On February 23, both Sidney and Tammy Moorer were charged with kidnapping in connection with the disappearance of Heather Elvis. On today's date, Sidney and Tammy Moorer will be charged with the murder of Heather Elvis, and a bond hearing for that murder charge will be held the week of March 17, and that is because it requires a circuit court judge to set bond on a murder charge. Do we have any questions?
Q: Can you talk, Chief, a little bit about these Indecent Exposure charges that started this ball rolling?
SR: I can speak about that. Jimmy? Do you want me to speak about that? Our solicitor's having a
you don't want us to speak about those charges right now?
JR: I'd rather not.
SR: Okay, okay.
Q: What (unintelligible) murder charges (unintelligible)?
SR: Um, yes, we have had some additional evidence that we located during the search that led us to the... giving us probable cause for the murder charge.
Q: Chief, that evidence was found inside the Moorers' home?
SR: On the Moorers' property. In the Moorer home and on their property, yes.
Q: Have you found Heather?
SR: No, we have not located Heather. That is something we are still looking for. We are still working on that.
Q: Are Sidney and Tammy Moorer cooperating with police, or are they denying these charges so far?
SR: They do have attorneys, and so we are working with their attorneys to establish communications at this time.
Q: Are you searching the property for a body at this point? Where are you looking?
SR: We were searching the property for any evidence that would lead us to probable cause in this case, a body included, but any evidence that could assist us in prosecution of this case.
Q: So, Chief, what leads you to murder charges as opposed to Heather Elvis just missing? I'm assuming there was something in that house that indicated a murder had taken place.
SR: Obviously, the investigation is still ongoing. We will say that the evidence that we located there led to the charge of murder.
******
Then she looked around and there were apparently no further questions, so the press conference ended. And now that the gag order is in place I'm acutely aware every missed opportunity to elicit even one more smidgen of info.
Parsing the bolded part, it sounds like something found inside the house contributed to probable cause for the murder charges, and something else found outside the house also contributed to probable cause for the murder charges. That's... kind of interesting to think about. At least two pieces of evidence in two different locations on the M property?