UPDATE: Details about the events leading to the murder were added at 7:41 p.m. Saturday.
A woman who was arrested Thursday on suspicion of killing a Fallbrook resident was connected to the other suspects accused of the murder through an alternative, polyamorous relationship.
Dorothy Grace Marie Maraglino, 36, , owned a house that the two other suspects list as their residence, according to the North County Times.
Maraglino also appears in photos with Louis Ray Perez, 45, one of the other suspects. Perez is a Camp Pendleton Marine staff sergeant.
He and fellow suspect Jessica Lynn Lopez, 27, pleaded not guilty to the murder last month.
Law enforcement discovered her at a hotel in San Diego after a failed suicide attempt. Her vehicle in the parking lot has a sticker depicting a woman on all fours wearing a collar and leash, according to 10 News.
Maraglino maintains a page on several websites catering to people interested in an alternative sexual lifestyle, according to CBS8.
She wrote in her bio on one website that she is "an alpha slave to master Ivan. We have a poly home in which I own two slave girls. Life is good." Perez also maintains pages on several sites, and calls himself "Master Ivan."
Maraglino owns the yellow stucco house in Fallbrook both Perez and Lopez list as their homes, though it is now in foreclosure. She bought the house in December 2009, but Bank of America filed a default notice two weeks ago, saying Maraglino owes $12,862, according to the Times.
Maraglino, who goes by the username "twisted2plusyou," appears with Perez in photos on the websites, and writes in her bio that she is the "care giver of the household and manages it according to (Perez's) wishes."
On the same site, she writes the couple was looking for another woman "slave" to add to their relationship.
"We are seeking a sincere submissives, perhaps with the potential of or the heart of a slave," she writes.
Perez, who goes by the username "DI_Ivan_34," maintains a profile on the same website. He states he and his partner were looking for an additional submissive woman for "asphyxiaphilia," caging, kidnapping, "mummification" and various kinds of physical torture.
Killgore rented an apartment less than a mile from the home all three defendants list as their residence. She was married to a Camp Pendleton Marine deployed in Afghanistan, though she filed for divorce three days before she went missing.
The day she disappeared, she was scheduled to go on a dinner cruise with Perez and another woman, but the other woman backed out at the last minute, .
On the night of the murder, Brittany's last communication with anybody was a brief, vague text message sent to a friend asking for help, according to San Diego sheriff's officials.